Jersey Shore ran it's course. It wasn't the same when they became multimillionaires. A couple of them are getting a little old. Seems like some of them are ready to settle down. They milked it long enough.
What ruined Jersey Shore was everyone getting into a relationship.
It was fine when it was Ron and Sam but JWoww had a relationship, then Snooki and Jionni got with each other and then Deena started dating someone. MVP were the only single people in the house. It was never the same after they went to Italy.