Changes can be done well, just look at how Paramount has been handling the Star Trek series Blu-Rays, particularly the original series. They updated things, they didn't change things. They did a CGI job on the exterior ship shots, to make it look more modern. They also touched up effects for interior shots as well and made more believable background when needed. Then they had the score re-recorded, since the originals were mono. They didn't change, they just updated.
And most importantly, while the changes were generally received very well with the fandom, they went ahead and included the original stuff on the Blu-Ray as well.