My biggest problem with this analysis is that all but one of the PSP Tales games also sold worse than GCN Symphonia. Again, this doesn't suggest that Tales did well on "Sony platforms" so much as that its fans were interested in picking a single home console console with high audiovisual performance where it could live side by side with other RPGs. The only platforms that have met that standard were PS2 and PS3 (PSP isn't a console; GCN didn't get much real third-party Japanese support; Wii had the GCN problem plus crummy visuals; Xbox 360 was DOA in Japan.)
That is quite true, sales suggest that Tales does best on home consoles, or rather on the home console of choice. Which so far also always has been a Playstation. Still, PSP Tales did better than not just DS Tales, but also than Tales on all other home consoles of its gen. And they weren't even main line games.
When I say loyalty it may draw up images of fanboyish behavior that indeed is limited to forums and, well fanboys, but being anime and not exactly targetting kids, Tales has a higher amount of nerd fans than say Dragon Quest. But the more important aspect of my usage of the term is simply that buyers have certain expectations of hardware makers, also ones that aren't in fact based in reality and so far the Tales fanbase seems convinced that Sony better delivers on those expectations.
Which is why sales favor a handheld with inferior graphics to 360 and Wii, just because it is Sony. You can put Tales on every hardware, deny them a PS3 tales for years but they still end up supporting the PS3. And in the meanwhile the majority of Tales sales end up on PSP, its gamers missing out on main line games for those years.
This isn't just true for Tales but also for other games of its class, the ones that rely on high visual fidelity to deliver a film like single player experience like FF.
I guess what you're saying is, if Nintendo was to launch a hardware again that can compete visually with the next PS (maybe even outdo it) and does it early enough, from a position of being the market leader even, Tales would do better on it than on PS4. Which might even be true. For that reason alone it would be interesting to see Nintendo do just that but right now it looks like they won't.
But if they would I'd rather expect that next gen Nintendo Tales would do better than all previous non-Sony-Tales but still worse than the Sony ones and probably even worse than the PS4 one. Because you can change reality but that doesn't already change the way people view reality. Sony fans think they have the best graphics even when you show them comparisons with 360 versions. They think the PSP has better graphics than the Wii.
So make a multiplat FF or Tales on new Nintendo and Sony platforms that are equal in graphics and still the majority would stay on the Sony side simply because they gotten used to it. There is no quick transfer of audience to be expected.
One of the most consistent lessons of Sales-Age is that no, they really don't. There are certainly extreme cases like the Xbox, but in general factors like ecosystem, other software successes, price and adoption curve, etc. wind up being much more important than fannish brand loyalty.
The problem is, it's not just the buyers who have these prejudices, or let's rather call them preconceived notions, but also the devs and publishers. The Wii didn't do as well as was expected of it and why it didn't is anybody's guess but you can explain it just as easily with terms like salted ground, inferior effort as by kiddy, casual, sucky graphics.
The numbers don't lie but the explanations don't derive from those numbers. Rather we try to come up with explanations that suit the numbers. When I say the majority stayed loyal to Sony that is simply a fact. It's evident in the numbers. Trying to explain beyond that is dangerous as it ceases to be provable (by numbers). Market research might be better equipped to provide answers here though.
And you can't tell me that KH didn't do worse than expected, 64 % sell through also suggests that retailers expected a little more. MH3G did not act as an umbrella for KH, and then why would it? KH isn't a multiplayer experience, it's a single player one.
Even MH, while succeeding in bringing the franchise to the 3DS, does so at a slower adoption rate than it did on PSP. Which is to be expected too. But the thing is there are people willing to "jump ship" and then there are stubborn ones.
It certainly made easier when people don't have a brand preference per se and the new console has so many similarities to the previous hardware of choice that they feel right at home as with the Playstation being more of a Famicom successor than the N64.
It only took Nintendo one fuck up to lose its leadership to Sony. Sony is clinging to its audience though, they lost only part of their leadership. The Japanese market is a fractured mess, yes, but that in itself is an "achievement" on Sony's part.
I think the Vita is the final fuck up Sony needed to lose its hold on whatever was left to them. Visual fidelity might become a moot point when publishers start acting globally.
On the other hand, they just did that with the 360. And it didn't work out. I hope Nintendo can do better, given serious effort by publishers. I actually want you to be right but sales data in fact reflects the obstacles that is prejudiced mind sets.