I've got serious doubts that this team would win a lot of games even if the coaching staff were entirely replaced with competent coaches. Certainly, the current group of boneheads "getting serious" seems unlikely to do the trick.
Whether they run a 4-3, a 3-4, whatever, this team will lack the linemen and linebackers on the interior to stop any sort of running game. It was already getting pretty danged thin. Now, Pierre, Perryman and Armbrister will be gone.
Maybe some combination of Jenkins, Wyche, Huertelou, Kamalu, and Moten could start playing effectively, but I have to think the lack of depth will mean that the 'Cane keep getting pushed around for another couple years. The problem isn't quite as severe at LB, but still I think Miami's ability to stop the run has to be in question next year.