True to that. But on the other hand, remember Vincent's reaction to Michael saying that all his life he wanted out, while Vincent wanted to move back in. This indicates that he wanted to restore the Corleone's criminal enterprise, instead of seeking legitimacy.

But I do like you're idea. It's very interesting.

The best concept would be a combination of all these elements. Vincent who heads the Corleone crime family, while Michael's son Anthony takes over Michael's legitimate corporation. Both organizations still closely connected and sharing their enormous wealth and network of businessmen and politicians.