Honestly I'm for this because it will increase Xbox market share. The PS4 had so much of a monopoly that making exclusive ps4 games with a bit of incentive from Sony seemed like the right choice. While I ordinarily wouldn't want any sector to get more consolidated, this will probably at least make things more competitive with new IP. Obviously the already existing IP owned by each company will mostly end up walled gardened, but probably less of the new stuff from third parties will. And Microsoft is likely going to be a better handler of that Activision IP than Activision was.