When I see some of the virtual reconstructions of Ancient Rome or Pompeii, I wonder if the real thing will be of less interest than the reconstituted, repaired one.
I think this is normal - there are now billions of people in the world and only so much "great art". I was in a huge crowd looking at the Mona Lisa. There was nothing magical about the experience. I'd rather have my own copy or put my VR glasses on and enjoy it in, say, the house where it was first displayed.
I can see museums fearing the loss of visitors or at least fearing that someone else will make billions out of virtualising it and they won't. I mean, search engines make billions out of the knowledge other people built over centuries. AI takes open source information and code and makes billions selling the embodied knowledge that was given away for free. It's not as if corporations aren't happy to rape the commons and call themselves heroes for doing it.
This isn't a good reason for the museum's attitude but I don't look to the future free exploitation of public information with unalloyed optimism.