You want to say that only the coins which will go ASICS mode will die but not all of them. There are like more than thousand coins which are mineable and thus we can always switch to one another and there will be no as such time when there is no coin to mine with the GPU miners. I am sure this is what will keep the concept of GPU miner always live and thus it wont die soon. I know there was time when we used to mine with the CPU's but over the time they got replaced with ASICS for the BTC mining. However GPU is something with more and more options available. So surely they are not dead yet and wont be any soon.