Minor point on the issues of whether the bootlegs are "technically" illegal.
They are. It's not "technical," either. It's pretty much out-and-out infringement of copyright law. It may not be actively policed (since that's up to the rights-holder, and Disney has -- so far -- been lax about this, as was LucasFilm much of the time), but it's still infringement.
There are some dodgy arguments that you can make as to why it isn't infringement, but I've never seen them upheld (or even addressed, actually) in a court of law. I would not expect a court to side with a licensee against a rights-holder in deciding whether a licensee downloading a higher-resolution copy of a work is actually infringement. I think there's a potential argument to be made that it isn't infringement if you already own the underlying work, but there's a counter-argument that even changes such as resolution improvements, color timing, and different audio mixes are separate derivative works, rather than a copy of the version licensed to the licensee. In other words, just 'cause you bought it on VHS doesn't mean you can download the blu-ray rip, even if you're talking about the OOT. You'd have a better argument if, for example, you bought a licensed blu-ray, the disc broke, and you downloaded a copy of the blu-ray again, but that's not what's happening here.
There's another less-discussed aspect of this, too, which is the provisions of the Digital Millennium Copyright Act. It's been a LONG time since I looked at that, but I think that it prohibits much of the decrypting of things like CSS on DVDs (and blu-rays? They may have some other encryption going on). Anyway, as I recall, at least when it first came out, the DMCA did NOT permit a licensee to decrypt a work that they had already paid for because the act of decryption for purposes of making a copy was, itself, illegal. As I said, though, I'm fuzzy on that and the law may have been revised in the last 14 years.
Regardless, if you download a fan edit of any kind, no matter how noble your reasons, legally it's still gonna be treated as infringement.
You wanna watch the OOT, the only legal way to do it is on the 2006 discs, or some previous version (VHS, Betamax, LDs, Super-8, etc.).
--EDIT--
Oh, and one other point of clarification. Lucas is no longer the copyright holder to any of the Star Wars properties. He sold that all to Disney. He's still the author, so things like whether Star Wars falls into the public domain (hint: not in our lifetimes) do hinge on him still, and you MIGHT have some authors rights to assert overseas (not really so much under US Copyright law, though), but Lucas' wishes no longer matter from a legal perspective. The only way they do is if there are clauses in the purchase agreement by Disney that restrict what can be done with Lucas' works (e.g. "You may never ever ever ever and we mean EVER release the Holiday Special in ANY format."). But as far as what matters from a legal perspective, Lucas' personal opinions are now about equal with all of ours. Namely, they don't mean squat -- again, from a legal perspective.