They've become much less common, but exclusives will always be around. As long as Sony, MS, Nintendo, etc, have a vested interest in pulling people towards their platform/service over their competitors (which will likely be forever), they will have incentive to develop their own titles and make deals with 3rd parties.
It also depends on the strength of each brand at the time. If we saw a console reach PS2 levels of market share again (reducing the 'need' for other platforms), we'd see a sharp increase of exclusives again.








