Unlike Riles, I don't think Danny has that love of the sidelines and desire to come back.
He would be a better coach that Doc, though. Then again, so would half the guys at the Y.
EDIT:
I sometimes wonder if Doc uses the wretched combinations he does or calls the plays he does to show Danny what the guys CAN'T do in an effort to make something happen (i.e. having House bring the ball up or TA shoot jumpers)? Danny knows what they can and can't do, and made the call to put these guys together. He must have something in mind for how they can play together. Clearly, Doc either doesn't, or he's got some other agenda in mind. Danny would be a MUCH better coach.