Wrong way to look at it. If that were the case then MS would just jettison numerous initiatives of theirs. Android and iOS app development, Linux integration, Accessibility products, etc.
But to put it into more concrete terms of why COD is so important as a multiplatform IP (similar to Minecraft).
- In 2021, Microsoft's More Personal Computing brought in ~54 billion USD.
- Activision-Blizzard's 8.8 billion would be roughly 16.3% of their total revenue for that division.
- Xbox Games (PC and console) is just part of that 54 billion. So Activision-Blizzard's revenue would be an even larger percentage of revenue.
- Warzone alone (a F2P product) makes ~5.25 million USD a day or almost 2 billion USD a year.
- Just that alone is roughly 3.7% of More Personal Computing's revenue and a larger percent of Xbox Games
- I'm pretty sure I read somewhere that most players played Warzone on PlayStation consoles, but I can't find it again, so take this with some salt.
- If my memory is correct, that's a huge chunk of money MS would just be throwing away.
- That doesn't even include sales or DLC from it's mainline COD products.
- COD WWII sold at least 12 million copies on PS4. If it released today and sold at PS5 prices (70 USD) that's over 840 million USD.
- Basically, just assume that currently each mainline release will average more than 1 billion USD on PlayStation when including DLC.
Sure when looking at the whole of MS, it's a drop in a bucket, but then so are most Microsoft products not named Office.
MS would like to keep COD on PlayStation due to the revenue that it generates, just like they keep all Minecraft products on PlayStation. You don't spend ~70 billion USD to then throw away ~2 billion a year in revenue from the entity that you just purchased. If anything, they'll try to play coy with it in an attempt to get Sony to agree to allow GamePass on PlayStation but they most likely want COD to remain available on PlayStation.
Keep in mind that Minecraft is currently by far the most popular and valuable gaming IP that Microsoft owns ... and it's on PlayStation.
Regards,
SB