The platform exclusivity stuff is going to be a wild run for the long run. Current assumption, for example, is that non-Warzone CODs will be exclusive to Xbox/PC starting in 2024. And I think most people on both sides have come to terms with that. But if the FTC can really be to that what the MLB League is to The Show, we really could be looking at COD staying multiconsole for a much longer time.
In that case I can see MS's plans for it changing (if they were at one point considering indeed locking it down to Xbox and PC) and bringing it to the Switch as well because by that point, why not? It's basically forced to be multiconsole anyway, might as well bring it to even more platforms like the Switch.
I think the FTC would only be considering that for the big revenue-generating IP, though, probably to ensure industry revenue isn't being adversely affected or something like that? Stuff like Crash, Spyro, Tony Hawk, even Guitar Hero (considering how dormant that's been) etc.? I don't think the FTC would care if MS made those exclusive or not.