None of the high power amps seem to do that, as I've seen anyway - do they make suitable thermistors?. are they too expensive?, and are they too unreliable?.
You also have the obvious problem that they are very time limited - once it's hot, it's hot (and it's likely to be very hot), and will remain so for an extended period. So once you've plugged it in, you can't move it (and plug it back in) unless you let it cool down first.
Hey Fred, the speaker leads won't reach - move the amp over here - BANG!!!! - why has the fuse blown to bits?.