Here is an article about gddr6 and it wont be ready till next year by Micron.
http://www.guru3d.com/news-story/micron-to-release-16-gbps-gddr5x-gddr6-next-year.html
You cant "milk" something if the technology is not there. Right now, we don't even have a monitor that can push 4k past 60hz, so even if they released a new 4k card today, the performance would be exactly the same until new monitors come out (which have been pushed to 2018). Nvidia released the 1080ti and dropped their prices on the 1080/1070 when there was no competition. I don't call that milking.
Intel has not released the 7nm chips yet because they are having issues with the lithography. The transistors are getting to the atomic scale when considering size. Again, this is about the technology not being there. Now I wont say that Intel has not coasted along over the past several years. But if they had a 7nm chip ready to go, they would have released it to fight Ryzen.