The keyboard is a good point, I myself have used keyboard on a console before.
However, consoles are designed so all you need to do is buy the game. If you have to go purchasing side parts (peripherals) to use the game then, it starts taking away from the purpose of a console anyways.
That aside, even if you DID use a keyboard, I'm not POSITIVE, but I do know that on any standard game, the buttons only correspond with the controller buttons, which means none of the numbers at the top do anything, and anything that isn't an a,b,x,y,l or r (and the window key) won't do anything.
Though they may change this if they start going all MMO on our asses, HOWEVER, that'd take some patching for specific keyboards I'd think, which is why it's hard to go MMORPG on consoles.