Developers can simply change Ethash algorithm to EthashRev2 and Equihash to EquihashRev2 if they wish.
Of course I doubt this is going to happen but they sure as hell could.

ASICs are extremely fragile towards any kind of change, if they could change they wouldn't be ASICs.

What attracts most people to GPU mining is the versatility it has.
Verge is pretty mineable with ASICs and with GPUs.