Personally I think Drogba should have been banned for the whole competition, for a year. That would have been a fitting punishment.
That said, he wasnt banned for nothing, and the referee should have been punished likewise. He should have banned from the Champions League for a year, or until he can prove he is capable of reffing at that level.
Personally, I have no idea what the refs punishment was, or where he is reffing now, because I do not pay attention to those details. Hopefully, he is not in charge of important games in the near future.