A new generation of GPU is coming + clever devs want to use more of the CPU / GPU advantages to make them much more relevant against FPGAs and ASICs. I think the relevant CN coins will follow Monero then adapt the changes to their algo (CN FAST, HEAVY, LITE, SABER...).
FPGA devs will have to adapt.
If new algos are going to be as unpredictable/difficult to optimize as X16R is, I do not see any long term revival. It is not about how viable a coin is - it is about mining it in a predictable manner. Most people do not handle uncertainty well.
Then those that cannot handle uncertainty well will be left behind, and those that can will reap the rewards. Thats not just mining, thats life.