The IGPs does not need to have 980TI perf in order to kill dgpus.
It does eventually, and I'm not seeing that happening anytime soon based on the last 3-5 years worth of CPU or GPU progress.
I hope they can pull some rabbit out of their collective hats and in a year or three I can buy a CPU with a 290x worth of GPU for $3-400, but I doubt it. And taking away revenue from dGPU outfits is only going to serve to screw those that still want them.
Other than making some money for people(intel) I don't see iGPU doing us (as in moderate to serious games, computer/hardware enthusiasts, etc) any good in the long run.