That's all well and good, but some coaches aren't meant to get them over the hump. Some coaches are meant to put you on the doorstep, and someone else pushes them through.
Do you want success or do you want to gamble?
I bet you Bucs fans would have rather stuck with Dungy and his program of success than to have mortgaged their future with the Gruden win followed by a decade of becoming the laughing stock Dungy brought them from.
San Deigo thought just winning 10 - 11 - 12 games a year with Marty wasn't enough, bet you they wish they had a normalcy of 10 - 11 - 12 wins for the last 10 years now, dont you?
It takes luck to win the big one, you don't get rid of sustained success