Michael cashes out, bestows lots of money on Kay, Anthony, Connie, Neri, etc., and lives in seclusion in Sicily until he dies like a dog. Vinnie goes back to the Street cause thats what he knows, and maybe rehooks up with Brigit Fonda.
"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"