GPU mining crash - Only if crypto prices collapse, or some company manages to create a profitable eth/equi ASIC.
Other than that I don't think there is enough GPU production to cause a collapse. Also if the crypto prices continue to fall, then more and more miners will sell their GPUs to gamers and invest directly in crypto instead.

ASIC mining however may collapse, unless coin values rise. More and more ASICs are sold and miners will continue to mine all the way till they starting losing money on power, and still the people with free electricty will continue to mine until their asic breaks. The Real mining DOOM