Really bad guys like Bernard aka Uncle Bernie Madoff don't live long in the joint. Oh it will take time for his fellow inmates to put together just the right plan. But offed he will be. That 150-year sentence was the play out of civilized thinking.
My hunch is that the strategy to end the Madoff menace is to stage a suicide. Yeah, the guy with the smirk and tic will be swinging from something in his well-guarded cell.