Not really. A refresh of pascal with faster clocks might give you 10%. Info on vega says its going to 13 -14 Tflops which makes it 30to40% faster than a TitanX pascal.
If true until Nvidia get Volta out, AMD will have the fastest card. I can only see a refreshed 1080 getting close to current titanx speeds. Thats a big gap to Vega.
Bearing in mind pascal was never meant to exist and was a last minute shoehorn into the roadmap as t65he gap between pascal and volta was too big, disappointing Nvidia is only offering another refresh for next year.
This should give AMD their chance to be king for a while so long as they dont mess it up.
That's the problem ( be king for a while so long as they dont mess it up.)