For the Colombo's it would be best if the Persico's relinquished power. Carmine should've abdicated the throne 26 years ago. It would have saved a lot of informants and the third Colombo war. But its not going to happen until maybe when Carmine dies.

The Lucchese's got rid of Amuso recently as boss, but the Persico's still have a tight grip on their family.

A far as members being absorbed by other families: do they even want that? You'd get a guy in your crew you don't really know, and who comes from a family full of rats.