The only way that could potentially work is if they significantly changed the way prestige was calculated.
Under the current system, your conference and your team's baseline prestige have a rather large impact on your prestige.
So in effect, you could take a middling team in a really strong ACC, he'd have a better chance of holding on to his job than a team with the identical results (rpi, etc.) in a less successful conference with lower baseline team prestige. And that obviously would be quite undesirable. For your suggestion to work, they'd have to dramatically reduce the effect that your conference mates' success has on your prestige. (Note: That's something they should do regardless.)
I'm all for ramping up firings, but (1) I don't think that is the answer and (2) I don't think WIS wants to ramp them up.