The fallacy here is that people are not simply buying consoles because exclusives. They buy it first because they aren't PCs and only then decide which of the console to get by exclusives. Believe me when I say that if there were no exclsuive games on consoles, they would still sell a lot.
Just listen to any console peasant rant on why consoles are superior and you will see that exclusives are just one point of many.
That's not true, if there are no exclusives, the wii u wouldn't even exist. Or it will die out like the PS Vita to the point nobody care anymore.