I don't think so, Berlusconi said some very nasty (but true) things about Kaka' and his family after he left Milan, and I think you can see from his reception in Sansa with Madrid what the rest of us feel. Sheva was different, for a start was close to Berlusconi - godfather of Jordan Shevchenko, who left in a manner that showed a great deal more respect to the man if not the club sadly, and Berlusconi always said nice things after (not about his wife though).
Then there is the practicalities. Milan play a totally different system now, Kaka' wouldn't fit. That and the wage budget is to be reduced further, so Kaka's wages are impossible. From the Milan perspective, Kaka' is just as ridiculous as Ronaldo.
That is why Ganso is almost a done deal.