I don't think the claim that the human eye can't see more than 30fps was ever supported by evidence, it was just "common knowledge" like other falsehoods such as certain parts of the tongue only detecting certain tastes. I think it was actually based on the minimum frame rate necessary for a human to perceive motion instead of a slide show. Scientifically, a quick Google indicates that humans can see up to around 90Hz for more normal cases and 500Hz for a specific edge-case [0].
When it comes to video compression though, industry practice is largely based on the result of user testing. There are well-controlled tests where a bunch of people are put in a specific test environment and shown videos encoded using different parameters and there are larger scale A/B tests where a streaming platform will tweak parameters and see how they affect metrics like time spent consuming content. So I'm confident that the compression of today matches the users and hardware of today.
However hardware can change and I expect that's what will drive increases in video quality. For example the encodes of today are biases to some extent by the fact that people watch videos on tiny screens like phones or tablets, which are likely a bottleneck for quality perception. If people start consuming more content on say VR headsets, streaming platforms may see the need to increase quality. 8K is also a possible driver (especially for very large displays).
Connectivity is also a big deal. Lossless music is possible because the bitrate is relatively low but streaming 4K blu-ray is out of the question for many people at the moment. In the future though it's definitely a possibility.
[0]: https://www.nature.com/articles/srep07861