Just my opinion but the answer is no. Nvidia has no reason to stop Pascal. AMD Vega/Polaris does not compare except on price/preference. If AMD does bring something out Nvidia will respond with the better architecture
I can tell you right now that you're 100% wrong about that. Nvidia might not have much competition from AMD right now but that really doesn't matter all that much because
(a) they already have their next series of chips - which they've already invested a lot of money into - being fabbed and packaged as we speak, and
(b) the number of potential new sales drops every day that there isn't a newer/better product on the market. Those that have already bought current gen products are much less likely to buy from the same product stack than they are to open their wallets for the next gen products, and those that might be considering upgrading from previous generations but haven't already done so are more likely to bite when presented with the newest and greatest.
Keep in mind that although mining sales have greatly increased, they can't afford to alienate their core gaming and business customer bases just to milk the fickle mining crowd.
