AngryGoldfish
Old N Gold
As you can see from GN tests, performance per clock is already much higher than Fiji, but that's for compute. DSBR looks like non existent and RPM is only a feature which uses FP16 for certain tasks, thus needing active developement for games and programs.
If Vega 11 will ever see light and will have something like 2048 cores and 32 ROPs, I'm pretty sure its gaming performance would be higher than 50% of V64 at the same clocks (assuming a single 1GHz HBM2 module is used). Maybe it will get even closer to 60 or 65% the performance of V64, given how the 512 SP difference in Vega 10 have almost zero impact on frame rate.
The high-end is usually more lucrative than the low-end and midrange (GTX 1060/RX 480 and below specifically), but in the case of Vega 10 versus Vega 11, based on Polaris' success, and if what you're saying is all going to play out as you say, Vega 11 could be more successful in the gaming market for AMD when it hits next year.