If OM are patient, he will succeed there. He is just too good not to. Patience doesn't seem to be the strongest virtue in their fanbase however.
Either way, I would be surprised if he were to come back here. As much as he would be welcomed back by many, the manner of his exit was a right kick in the bollocks, and I suspect he wouldn't have the same level of unreserved love from others, myself included. I think his entourage would also view it as losing face and dare I say it, a step backward after making the plunge and leaving.
If it doesn't work out there, he'll probably end up being loaned or used as a sweetener to another team in Europe, and it could end up being one of the biggest wastes of talent in footballing history.