There will always be new coins to mine so I don't think gpu will ever die. Asic's are so specialized, they seem to go obsolete pretty quickly.
New coins may start to move away from POW as well is the point here
One thing starts and everyone follows
sometimes you never know how much effect or influence something can have
and sometimes things go so fast because you have to react
which is point for this conversation
so we can think about it
yes it wont die, at least not right now
BUT if may slow down a lot in the coming 1 or 2 years if everyone starts to ditch POW