Quite apart from the issue of the preservation/restoration/availability of the OT, I think one major issue with the SE changes is that they don't fit with the original films and show a lack of understanding of those films. Like the awful CGI Jabbas, the cartoon creatures in the Jabba's palace musical thing, Han shooting second, Hayden Christensen replacing Shaw, Temuera Morrison's pathetic voice work replacing Jason Wingreen's great work, etc. That stuff is more like pure vandalism than it's like any sort of valid artistic alteration.

It's not so much like a case of some artist coming back years later to change their work, so much as it's like a case of an artist going nuts and being put in a mental asylum and twenty years later escaping and crapping all over their work.