No this won’t happen. They actually were thinking of switching to an algo called ProgPOW a few years back to get ASICs off the network and last minute it was cancelled. It was cancelled because the ASICs aren’t a 51% attack risk so they moved on.
If there are going to be issues with ETH going fully POS they will just revert to the old mining algo, I don’t think they will change it so ASICs get booted off the network.
Ok thanks for the reply, its just a thought though and I don't have any proof on what I posted I'm just guessing maybe my thought could happen, let's what to see what they actually decide to do, Pow or PoS its all good for me.