Biasing tubes is pretty simple most of the time: Pick a bias current, set up the voltages, done. However, some types of solid state devices, like bipolar transistors for example, can be much more troublesome. If you use this simple "set and forget" bias scheme on a high power MOSFET amp, what might the likely result be?

It should work fine, MOSFETs are temperature stable

The bias current will actually drop with increasing temperature, protecting the device

The bias current will rise as the device heats, possibly running away until the part detonates

My head hurts, I'll keep using tubes

Answer: The bias current will rise as the device heats, possibly running away until the part detonates