I'm not saying it's a direct result of Wallace's statements, but the Celtics did play with much more effort and energy last night than in the previous couple.
So, while his words may not have been the cause--they probably would have decided to compete harder for the sake of their own pride, regardless--they certainly didn't seem to hurt team morale.
That's really all I care about. If he's not hurting the team, he can say whatever the heck he wants as far as I'm concerned.