About the Nvidia is doomed thing just remember how long Nvidia had ATI beat with the 8800Gtx took Amd 2 gen's i think(Ati 4870) to beat it. If i remember correctly Nvidia was going to skip 20nm and go for 16nm FinFET however from the sounds of it that will probably not happen for 2 years perhaps we might see a couple of products from Nvidia being built with it but not the whole generation.
Old but still from 2014
http://www.kitguru.net/components/graphic-cards/anton-shilov/nvidia-may-skip-20nm-process-technology-jump-straight-to-16nm/
Mobile parts from Nvidia using 16nm in 2015
http://www.tomshardware.com/news/tsmc-apple-nvidia-denver-finfet,27538.html
http://www.kitguru.net/apple/anton-shilov/samsung-to-produce-14nm-finfet-chips-for-amd-apple-qualcomm-report/
"It is very intriguing what AMD could produce at Samsung using 14nm process technology. In case AMD indeed manages to make a mobile SoC at 14nm FF node in the first half of next year, it could probably finally enter the market of tablets with a rather competitive offering. Unfortunately, based on AMD’s roadmap, it only plans to release 20nm project Skybridge accelerated processing units and SoCs next year. While it is possible that AMD could make a surprise with a 14nm chip, the company is not known for surprises…"
My main concern from Amd is they are to quiet and the history of that is never good(either won't be out for awhile or they have a dud), when the 7970 was finished Amd rushed it as soon as possible to show it off since they knew they had a winner.
If it wasn't for Jim keller and now Samsung i wouldn't have to much faith left for Amd