At the end of the day neither the ASIC nor the moves by ETH to POS are friendly to GPU's.  ASIC's and GPU's are just tools to mining.  I don't find either one to be of a particular advantage and both have their issues.

Centralization of power on the network is just a fact.  Until other big players look at the value proposition and decide to full on compete with Bitmain we are stuck.  That is just the sad state of things.  We should count our lucky stars that Bitmain even sells these miners to be honest.  Image the nightmare of a company like Bitmain making and keeping in house all this mining power?  They would own the hashing power and control the networks. 

So while things suck they could suck a lot more. 

ETH going POS is going to cause a significant disruption.  I don't see how anyone could dispute that fact that everyone with GPU miners are going to be shifting all that ETH hash looking for something profitable to mine.  It is going to be ugly and just about the equivalent of Bitmain dumping a metric TON of D3's on the network. 

Bitmain could have and should use some judgement on the size of the hash power on a given algo and then decide how many miners they can release  and not destroy the network.  This is a GOD like power that they have right now and they have not used that power wisely.

ASIC's and GPU's are tools.  Choose the best tool for the job.  Anyone who has followed crypto's from the beginning will remember the same sky is falling uproar when people figured out how to leverage GPU's in the early days of mining.  The world was coming to an end then too...  This is an arms race.  If you want to be competitive and possibly make a little coin then you have to get on the treadmill and keep upgrading your arms. 

Devs deciding to fork coins and switch algo's will only be a temporary hindrance here for hardware mining tools.   This arms race is going to escalate.