I feel like the future of porn is more expansive appeal as more kinks and fetishes are served with higher production quality over time. But that kind of picky viewing is also going to have a price tag for the foreseeable future, and I'm sure content providers are going to find more straightforward ways to monetize it. Interestingly, it seems porn companies are more interested in quality of life features and overall value than traditional entertainment providers like (e.g. Netflix).
Of course, ease of use is more crucial when you're trying to serve an audience that's often trying to keep their porn habit under wraps. However, with the stigma of porn gradually dissolving, that also adds opportunities to the industry, so I expect to see some bigger budget versions of the weirder kinks in the near future. VR is also getting cheaper and more portable so I agree that's going to grow a lot over the next few years.