In terms of consoles sales, Uncharted 5 could be PS4 only exclusive game (not counting console exclusivity like SFV) for the entire generation and the PS4 would still have the most sales if all future third party console game keep releasing for it. PS4 is just too attractive for the mainstream audience to be in 2nd place now.
On topic: I don't think most gamers really care about exclusive if all the major third party games keep coming for the PS4 and are the best versions as well. First party is great but when you already have a lot of good games for your system, its just icing on top. Forum goers like us probably care more though but we are a tiny few.