I would welcome him back, then check to see if he plays 100% for us, if/when he starts to dip back down into apathy then i'll be calling him all sorts.
One of the problems with Robinho in the side was that, following that first half of the first season, too many players thought he could beat the opposition on his own. I think it was only The Emerald Prince that really understood him.
Get him back and put with Ireland - but only at CoMS!
Bellamy isn't getting any younge or fitter. If Robinho's attitude changes after the World Cup and dedicates himself to the Club and the Manager then I say get behind him and give it a try.
One more chance and if he fluffs it he's the loser and OUT.