I reckon at some point they are going to have to beef it up, yes. I bet Kaap's V would fly on water. In fact I already know it would, that hairy bloke did a AIO test.
I did some checking yesterday before I broke my rig down and I found a post that I made just after I water cooled it in summer. I was barely hanging onto 1800mhz. Now? I can boost to 2000 easy (winter vs summer). I am hoping the double rad improves this so I can maintain that clock all year around. But yeah, Nvidia have to do something. It wouldn't even matter if they made it triple slot, because who runs SLi these days? or rather, who supports it? that would be nay coont
Difference between Nvidia techs and Vega is the scaling and improvement with clocks. With my Fury X it didn't seem to change anything, then it would crash. The gains from OCing Vega are nowhere near as good as Nvidia either, because it is already running quite close to flat out. The Fury X was running flat out, you'd have been lucky to get 50mhz out of one tbh. It really is dire.
Nvidia are in much better stead and a much better position to leave in big clocks though. I mean stock clock for a 1080Ti is about 1560something right? so 2050 on a Titan XP is a pretty large boost. And it scales too. 2000mhz is 25% more than 1500mhz and you get right about that back in performance for your bother.