Lets pretend Bitcoin really did upgrade to a new POW algorithm and left all the asics and mining farms, mining equipment and whatnot useless. Is this really what Bitcoin needs? I dont think this will have a good image to the general public. It could be viewed much worse than Ethereum's hard fork.
In every job, if you do not do your work, you get fired.
If Miners stop to work on the protocol that the majority of users want, it's only natural to fire the miners and hire new ones.
Can't see anything wrong with that, it will be seen as a strength of bitcoin.