i think godfather 4 should be about vincent and not micheal and should be set in 2000 3 years after michaels death.
the storyline would be about the fall of immobiarre and how vincent is struggling to keep up with the finance and he owes money to the vatican. the board of the vatican has put together a plan to take vincentout of immobiarre. also vincent has never gotten over marys death and he finds it difficult to cope ever since she was killed. anthony has never got on with vincent since marys death and tony blames him for her death saying if he never fell in love with him then it wouldve never have happened as mary wouldnt have had to talk to her father wem she got killed by mosca and she couldve left a lot easier. tony then plots against vincent with the board of immobiarre. vincent luckily survives the plot by finding out from an informer he hired and he kills all the members of the board and killing michaels son and devotes his life to his aunt connie who is very ill and needs taking care of and quits the business.