It's fairly clear that the current intent of Microsoft Gaming's leadership is to continue to make CoD broadly available in an ongoing basis. It's not guaranteed that Phil Spencer and other high ranking figures will still be leading in 10+ years time, however. It's also not clear whether future economic considerations will be the same as current ones. Things can change, basically, and it's not simply a question of whether you trust one person or not regarding their word.
I don't really agree that if in 10.1 years time, some future leader of Microsoft Gaming decides that actually Call of Duty Modern Warfare 3-3 (the 3rd entry in the 3rd MW series) won't be on PS6, there would be such a tremendous backlash that nobody could ever concieve of doing it. At least not from people who matter. Because while some people could be mad, it's also entirely possible that CoD campaigns aren't that big of a deal in 2033 because most hardcore cod people are just playing CoD Mobile 4 and Warzone Mobile 3, it's possible that Xbox could be a significant market leader in consoles such that the downsides aren't that notable, it could be the case that much of the console CoD audience already migrated to Xbox because of soft factors like it's long term presense on gamepass, and so on. The PR impact of a move like this today versus 2033 need not be remotely similar.
I am not making this post because I'm saying I think this is secretly a long term plan they have, just that future prognosticating on 10+ year horizons and making absolute statements is going to be a fraught business especially in a space as dynamic as videogames. Ten years ago, the original THQ was still in business, the battle royale genre didn't exist, the WiiU was a going concern recieving Call of Duty games alongside their peers, many industry analysits thought smartphone gaming was going to totally destroy consoles in the near future, Sony seemed to outside observers like it was kind of on the ropes, and Microsoft exectutives had convinced themselves the future of consoles was entirely about TV.
