Who am I to tell one of the biggest publishers in the world how to do their job? But hey, I'll give it a go.
Do I think MW Re-mastered (MWR) behind a paywall reduce the sales numbers of Infinite Warfare (IW)? No. A 'boycott' would never be on a big enough scale. If IW doesn't sell as many copies as previous COD's, it will have little to do with MWR.
Will it increase sales of MWR? Likely, yes. With it included with every 'upgraded' copy of Infinite Warfare, it will be one of the biggest 'selling' games of the year. A standalone re-master would have done well for enthusiasts, sure. But I don't think it would outsell the 'latest' COD.
Had they sold separately, would Activision sold more copies of both games combined? Possibly. And this is where it gets most interesting.
You will notice the one question missing is: Will MWR included increase the sales of IW? Of course it will. People will buy IW to play MWR. They will. Activision know it. You know it. You may not, but lots of people will.
Activision could have done this one of many million ways, which I am sure they explored in great detail. People with far more information than me have likely run all scenarios. One option I am pretty sure they didn't consider was launching BOTH games at the same time independently. The reasons for this should be obvious (cannibalization of their market).
I am guessing they looked at the following:
Alternative 1: Full re-master of MWR.
- A full re-master. All maps. All missions. Everything.
- Extra/New content. A new side story. A spin off campaign
- Released in Holiday 2016
- Full retail price
- No 'new' COD in 2016
Give MWR the spotlight it deserves, not just an added pre-order/paywall bonus. It would sell to enthusiasts, but what about people wanting something fresh? A bit of bolted on content would be nice, but is it enough? Battlefield is releasing the same time. Risk is losing mind/market share to a competitor.
Alternative 2: Same re-master, released in H1 2016.
- Same re-master we are getting, limited maps etc.
- Released before E3, so sometime between March-June
- Budget retail price of c$40
- IW releases as planned in Holiday 2016
Another great one for fans. They get a standalone game and it would sell well, likely winning it's launch NPD month. Even beating Dark Souls and Unchartered. However, BLOPS3 is still in the top 10 NPD every month. COD is still selling. MWR would give it a bump up in sales, but not at peak season. Also, it would be either 'rushed' to market or put out unfished. Resources are not available to 'complete' the re-master as they are focusing on IW.
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In the end, they went with the bundled/paywall option. The alternatives just posed too much risk to Activision and the COD brand. Simple as that really.
Also, don't be surprised if you 'need' IW to launch MWR, so selling the code wouldn't be worth anything.
NOTE: I am not saying this is 'right', 'fair', or the 'the best' thing to do. Just posting my thoughts if I was in their shoes.