Time will tell but my own experience in limited scenarios is the GPU grunt is there but the VRAM isn't. And for reference my Pimax 8KX is being run in normal or small mode and nowhere near the 4K x2 resolution. I also have to undersample to 60% SS to keep performance respectable in some games. So even a 3090 will need to run at lower settings on a Pimax 8KX.
So when I run freeflight or a small DCS Normandy mission then performance is perfectly fine at 60 FPS+ with 9.8GB VRAM used. If it is a larger mission then VRAM usage goes over 10GB and performance tanks.
if we have a simple yes or no answer then the answer is NO because you have absolutely no idea what games/sims or uses other people have. So if someone were to ask me is a 3080 good enough for hi res VR in DCS, my answer would be NO.
As LTMatt has said, is 10GB enough? For most scenarios yes, for all things no.