Exclusive Games is what defined consoles in past generations.
But it's more economically sound for 3rd parties to make non-exclusive games it seems. So chances are the list of exclusives will shrink considerably as time goes on.
I mean, the only ones who will have exclusives now is Microsoft owned, Sony Owned, and Nintendo owned franchises. It's not a bad thing, but 3rd party exclusives will be a thing of the past I think.
What should not be exclusive is Downloadable titles though. But that's a rant for another day.