I think one of the biggest factors to ensuring JP's success is the offense itself. The players. They will need to support him as well. I'm not talking the lip service in the papers. I'm talking they have to accept that he is the man. And he in turn must take that role and back it up. He needs to take charge of the line, the WR's, backs,...it's his car now. No matter how simplified the playbook is modified to.
In the end, it's up to JPL.