I would not expect too much. The VR hype is over and most museums are facing major other challenges and do not have time for VR – unfortunately. Also their personal focus is more on 3D scanning for preservation than on 360 tours for virtual visitors. They need real visitors.
Besides that copyright is often the showstopper. If they do not own all rights on their exhibited items, they often are just not allowed to do this or had to pay extra for virtual publication which they rarely do.
But I hope that more than in the past contribute to projects like e.g. Europeana.eu