I would be interested in trying to play slots or poker with a VR headset, but I don't think it will find widespread use for at least a couple of years. Currently there is too little infrastructure for developers and the technology is still very expensive for a wide range of users. If we talk about Web 3.0 integration, I don't think it's difficult to implement.
I agree, VR is far from perfection, but the technology is already there, we just have to tweak it even more and wait for better hardware to produce better and smoother animations when using the headset. Oculus, HTC, and Sony are all pushing VR to its current limits, and are making VR headsets more accessible to a lot of people. Then again, demand isn't there yet, more so about gamblers wanting to experience VR casinos when they can still go to a physicsl one and get the full experience there.
If be interesting to bet and do some bluffing in the VR world where users can see face reactions. Its enjoyable to play that way like a real life poker table.
I can only imagine how addictive it could be when this happen though. Users may think its risk free to cheat as well ( if there is a cheat). So I'd be amaze how far the developers can think of solutions for this as well whether it comes in VR world too like self exclusion.