Keyboard yes, mouse no.
Full support for mouse will damage the "fairness" in games such as fps, and will "force" players to go for a mouse rather then a controller if they wish to remain competetive in such games.
The problem with this is one of the consoles greatest strengths is that you can sit back and relax in a good chair rather then sitting in the usual "Hey, Im saving up for a hunchback" pose, that the mouse and keyboard usually leads to.
Other main strengths being the fact that everyone you play against has the exact same hardware/software, while not having to upgrade it once a year.
Aswell as hacking being less rampant then on pc.
Consoles need to embrace the few things they offer that the pc don't or else they will become redundant over time.