I would care if they were unavailable, as they would be very noteworthy historic curiosities. I would want the altered scenes available as extras at least, but if you are going to do that then you might as well branch them back in; after all, if it was good enough to release in theatres, it should be good enough to let people see on video. People here go nuts over any sort of "alternative cut" of the films, this would be a holy grail of sorts if it had never been released, and I think most people would agree that at least some of the alterations were welcome and enjoyable.

I don't know what we would do about preserving it if were never released on video though--a theatre cam bootleg? I don't think there ever was one. Probably we'd just go by stills and highly detailed accounts of the film, probably confirmed by 35mm collectors. Probably eventually someone would throw up a 35mm print and film the screen and then leak the footage on Youtube so you have a crude representation of the changed scenes. I don't think there would be a huge fervour over it all like with the OOT though, it would like the way the deleted scenes or Holiday Special was treated, e.g. highly sought after and enough to make you buy a new boxset but not any sort of requirement.