RX Vega, gaming performance underestimated ? What would happen if RX Vega give a surprise ? (gaming)

It seem Vega is about 2.15x Polaris on paper. 
But it offer Float16 , something that can be leveraged big time in game shaders.
And this is something Pascal does not have...

So RX Vega seem to be between the 1080 and 1080ti in term of performance, but it could pass the 1080ti with games leverage half / float16.

So for consumers, could the fact that Vega is more feature rich, more future proof (8GB with the cache is like having a 16GB card), and some games show better performance then the 1080ti because of the FP16 shaders give them push to buy Vega Vs Pascal ?

It seem that this is a possibility, and it would make AMD capture massive market share in the second half of 2017. (Q3 / Q4)

Maybe I dismissed the RTG group to soon.