There's a first for everything.
nVidia have never stopped short at screwing over the customer - look at the Titans, etc. to think they wouldn't make the 80ti extremely short lived just because it suited them and not because of any competition is a little naive.
You do realise it would probably be easier and cheaper for them to just stick with what they have,as production costs should start to drop over time anyway?? Moving onto a new node with GDDR6 is going to be costly especially at the start,so again if there is no competition why bother?? Remember,even with the GTX1070/GTX1080 AMD did have the Fury X which was not quite a GTX980TI but still close enough,so it made a lot of sense once the node was viable to make sure they released them.
AMD has nothing to compete with them currently,so the only way I believe Nvidia will push a GTX1080TI beating Volta part on new node and with GDDR6 this year is if Vega actually is competitive,ie,gets close enough.
It happens with loads of other electronics and engineering areas too - companies will only take the risk if they can drop costs and if there is more competition.
People act like Nvidia has not been dominant over ATI/AMD,etc before - do some of you forget how the G92 was literally rejigged for so long?? Why?? It still had competitive performance and power consumption to what ATI had out at the time. They didn't NEED a new expensive chip,and made a ton of money doing it.
My viewpoint is if Volta is released this year it will be for a commercial card,and if we do see a consumer card,it will be something akin to the GM107 - remember Maxwell was a major uarch change and it debuted on a £100 card,8 months before we saw the big guns. The only way that Nvidia feels the need to push out a very high performance GAMING card is they feel the GTX1080TI/Pascal Titan XP has lost its sheen against the competition.
OFC,we can agree to disagree,but you need to be wary that if people think that a high performance Volta gaming card is out in a few months time,they might just hold off getting a GTX1080TI too.