I'm convinced we're stuck with Rumph/Patke/etc because Manny wants to run HIS scheme no matter what. He wants HIS defensive philosophy.
The problem is, there aren't many people out there who run Manny's scheme. He's just recycling dudes from his own coaching tree like Blake Baker, who he hired in as a GA, or Mike Rumph, who he brought in from high school. Basically, yes-men.
What he really should do is just go out and hire the best DC and position coaches Miami can afford. But I think he's too prideful for that.
But we'll see. If the worst defensive performance in the history of the school doesn't get anyone on the defensive staff fired, then nothing will. Manny will ride with his schemes until he's fired in a year or two.