I agree, especially if they had sequels. From around the same time, Alien has had a strong re-release and home video history (The Black Hole, not so much). But for that very reason I can't really think of them as "forgotten" films.
I still feel like TMP is a bit of a forgotten film outside of Trek fandom, The Black Hole definitely is (and I love that film, wouldn't mind seeing a remake to be honest), it's definitely not got anywhere like the popularity of Alien, Close Encounters, ET etc from that era, I know it didn't pull in the same box office as those but it still did more or less 500 million worldwide adjusted for inflation. I dunno, I guess I'm just hankering for a release of it.
I don't know, I'm fine with the original being the default HD release. That's the most historical version. If only Star Wars was in the same situation!
That's a good point - though I feel the additions made in the DE for TMP are nowhere near as divisive as the SW ones. A lot of them are undeniable improvements that fit very well with the original style of the film - the Vger energy weapon and the hull walk are two great examples of this. There's certainly no dumb-looking CG creatures running around like they just wandered in off a third rate Pixar movie, but yes, I'd like the unaltered SW trilogy in HD too.

I suspect a lot of the relief most of us felt at the DE was at least in part because it's like, it salvages material from both earlier versions but doesn't feel plodfing like the SLV does in places.