Some will stay, some not.
I was and Iam still a zidane fanboy. By the time he was leaving, I was seriously thinking to switch to real madrid, but by that time i was already fond of juventus, and i didnt had the guts for such a low move. So I decided to stay with juve, and here i am.
A friend of mine who presented me zidane and juve, and who used to see eveey jugave zidane game with me, didnt resisted and switched to follow real madrid. And then after Idane retired, he was in the wilderness.
Now he supports arsenal. Poor soul.