Games should be exclusive for certain consoles to promote that console, if there wasn't any games exclusive, then we'd all have either Microsoft products, or Sony. We'd never have both, leaving the companies either rich or poor. Since if we owned a PS3 (Or a PS4) we would never have to buy an Xbox for certain titles.
I think not because game consoles can make loads more money and make new ones with the money. also think of titan fall if that was just Xbox one people would be really bumbed and they would make no money.