Can anyone guess ways to continue to be successful with Brees?

I would want him back. Very unlikely we do anywhere near as well as we have done the past four years with anyone else. Even more unlikely we will do as well next year in my judgment as Hill lacks the accuracy and field vision necessary to be a consistently successful QB and Jameis lacks the judgment and maturity necessary. So no one on the current team is likely to have us even in the playoffs next year except Drew. Any free agent QBs that might be top tier will cost more than Drew does and the success rate of can't miss college QBs that are drafted in the first round is maybe 20% last more than 4 years on anyone's roster.