I don't know a lot about ETH mining -- I dabbled in it a few months ago with my GTX 1060 on my personal computer. Was interesting to see that I could still (barely) break even (before ETH value tanked... I think.. I don't really remember).

I was watching @crypt0's video that he put up last night (or the night before? not sure) where he talked about these ASIC miners, and how apparently the difficulty level of mining ETH skyrocketed around December / January. I think he was suggesting that ASIC miners had probably already been deployed an in-use (by bitmain or others) -- and now they're only selling because they have more powerful ones coming up in production for themselves.

I was only half listening while I cooked dinner, but I think he was of the opinion that a HF would likely only be a temporary fix, and that the only full solution would be to switch to PoS -- which would also upset a lot of the miners. I'm not certain if I'm summarizing his views, and I'm not really trying to speak for him anyways -- just my take of what very little I know.

tl;dr -- I doubt a HF that doesn't pivot ETH to PoS will do much but be a temporary slow-down to ASIC producers -- But I also don't know what I'm talking about.