That is exactly why they will change to this new algorithm ETHW so all the GPU mining can continue with this new coin,we don't know how things will go but as a first step we need the pools live as soon as Ethereum mining moves to PoS which will make it not mineable anymore.

Asics have their own market share but it may be that because of the initial price of this new ETHW coin the Asics won't be profitable at all but even if they can be profitable why do we care,we are all mining in the same network and sharing the pie with each other,that has also been the case with Ethereum mining so it is nothing new with ETHW fork.