You're diminishing sales numbers of older games by using sales figures of games nearly 20 years younger. The Witcher 3 sold over 4 million copies you say?! Do you think that might be due to multiple factors, one being its multiplat, but the chief of which being the number of people playing video games in general has grown exponentially...?
This is like the argument over box office revenue when we have individual butts-in-seats data right here. I would hope that in another 20 years sales figures of games will have risen, too.
In other words, you're using bad comparisons.
I'm ignoring your sales figures for the games that are in completely different genres, because if you dig a little deeper, guess what outsold Skyrim? Pokémon Gold and Silver (23 million). You know what outsold that? Pokémon Red/Blue/Green. (23.64 million).
https://en.wikipedia.org/wiki/List_of_best-selling_video_games
And how many years did it take Pokemon Red/Blue/Yellow and Pokemon Gold/Silver to sell that? The first week Gold/Silver went on sale in Japan, it sold 1.4 million. Its LTD in Japan is approximately 6 million. But that's from 1999 to today: 16 years. You're citing lifetime figures for sixteen years of sale. Skyrim did it in less than two.
Speak for yourself, and use a better comparison: Pokemon X/Y released about two years ago. Wiki states that its sales as of March 31, 2015 (after 1.5 years of sale), are 13.85 million.
Your numbers also indicate a decline in sales between Red/Blue and Gold/Silver. In comparison, The Elder Scrolls: Oblivion sold 3.5 million over 4 years. Skyrim sales showed that the audience for the game expanded, and expanded significantly. It gave the publisher confidence in funding sequels and successors because there is a giant chunk of change to be made.
I'm hardly diminishing sales of older games. You're the one who brought up FF7's total sales numbers from 2010, to which I responded accordingly with contemporary numbers of contemporary games and brands that have long exceeded FF7. We haven't argued over revenue, because sales = butts in seats, it's not a raw dollar value. You just fixated on the sales numbers and missed the forest for the trees. The point I'm making is that the contemporary market is different from 18 years ago. It has different tastes. It wants different things. And many of those things, as shown by the popular games of today, suggest action-oriented gameplay is popular.
13 years for FFVII sold 10 million copies? I could have sworn that FFVII sold 9.8 in like 6 years. FFXIII didn't ship 13 million and action-based doesn't mean anything. FFVII is a popular game, why change the battle system around for?
It wouldn't be FFVII anymore.
FF13 not shipping 13 million is indicative of a decline in series and brand popularity. It does actually mean something. It means it's questionable that the remake will actually sell 10 million regardless of whether it has an action system or a turn-based system. Because the value of "Final Fantasy" as a brand has diminished over time.
Arguably "Final Fantasy 7" could be a brand by itself, separate from "Final Fantasy", but its modern value hasn't been proven in digits close to a million. We can only evaluate its port sales.
Gaming becomes more commonplace with every passing year and the lowered bar of entry.
You do the math. The market of 2015 is larger than the market of 1997. Sales figures will continue to increase proportionally. If they don't, then the game had less market penetration and objectively didn't sell as well.
If FF7 was being thrown at 150 million PS1's and sold 10 million copies and continues to lead charts on re-releases, and the number of PC's is in the billions but Skyrim only sold 20 million units across that and two consoles, both of which have an install base of 80 million, pound for pound FF7 should be recognized as being a stronger release.
Would you also like to account for how many more games there are, competing between today's titles? The expenses and time for development, etc.? Increased rate of piracy because of availability on PC, and whatnot? Competition from the huge market of mobile games?
You stated that FF7 had sold 10 million copies by 2010. Don't use "2010" and then complain about comparisons between games that released in the last 5 years and a game that released 18 years ago. Moreover, it's dishonest to claim that the PC gaming market consists of 'billions' because of the amount of computers in the world, when you know that the gaming market doesn't include every single computer user.
Saying that FF7's strong performance from 18 years ago is an indicator of how it is a stronger release than Skyrim TODAY is an opinion of little rationality. The reason why one would look at contemporary games to get an idea for what would sell is because the market now is not the same market as 18 years ago. It's the disingenuous reason for why you positioned FF7's 10 million sales number into 2010 in the first place: to make it look like 7's immense popularity is still current. CDs were very popular 18 years ago; people don't use CDs anymore in 2015. But hundreds of millions of CDs were sold between 1997 and 2010! It must still be really popular! That's not how it bloody works.
I'm not strongly on either the turn-based side or the action-side. What I disagree strongly with is your position of
fuck the newcomers, because that position ensures continued decline. Square could just so easily shave the budgets and make mid-tier Final Fantasy and then the same people would complain about the low production quality, the rushed work, and the lack of cool cinematics (see Lightning Returns). Or they can just take the series and go wholesale mobile. But they don't and they understand they need to improve and change because that's the way to survive. Being conservative and keeping everything the same isn't the way to do that. If it means adapting to a market that wants an action-oriented system then so be it.