It won't kill 3rd party support, but depending on how well 3rd party companies do on the Xbone then the PS4 could start losing support. Some games will be exclusive to the Xbone, the PS4 could get "bad ports" because devs focus will the on the Xbone, etc.
But in the end 3rd parties can't support only one console, it wouldn't make sense business wise.
Nintendo and PC gamer








