OK, say the TESB screening was the 1980 version sporting a nice pristine print...
...
Wait for it...
Let's get conspiratory:
Just imagine that this whole Special Edition deal is just a big, ville marketing scheme carefully crafted by the profit-master Luca$ and with this notion in mind take a little tour through the history with me:
In the early 90s the STAR WARS franchise is pretty much dead, there are a few devoted fans but most people have moved on to other things. Lucas hires a renown sci-fi writter Timothy Zahn to write a trilogy of books that would basically be sequels to the SW Trilogy. When those books come out, they are an immediate success and give the old hype for SW a new spark.
In 1995 Lucas announces the production of the SEs and says that the current VHS and LD release will be the last time the original SW will be released on any home video format, thus maximizing the sales.
1996 the Shadows of the Empire project comes out, further reinforcing the new SW hype.
In 1997 Lucas has the SEs made not for his money but for the 20th Century Fox's and releases them theatrically not only bringing all the long time fans into the cinemas but even the casual viewers, who were curious about the "newly enhanced sound and visuall effects" and thus making enormous amounts of cash in the box office.
Later that year the SEs come out on VHS and LD selling greatly because the general public wants this new improved version of SW.
This year also sees the debut of a new format called DVD.
2000 The SEs are re-released on VHS along with Episode 1 with covers that fit the E1 release, making many people buy them to look good on they're shelf. The fact that these are the SEs is not mentioned anywhere which is justified by Lucas by stating that these are the only versions of the OT from now on.
2002 DVD surpasses the VHS sales and the fans demand their favourite films on this new widespread format. When the demand is not met, the bootleg market for SW DVDs starts growing rapidly.
2004 The massive bootleg sales don't escape Lucas' notice and he succumbs and releases SW Trilogy on DVD. Although it is a half-arsed release of the SE only, it sales incredibly well because the general public doesn't care. And it is enough to kill the market for the SE bootlegs. But as Lucas keeps saying the SEs are the only existing versions of the films and he will never release the OOT, it opens a door for the OOT bootlegs, which are mostly sourced from the 1993 Definitive Collection LD.
2006 Seeing that SE release didn't kill all the bootleg activity he recognises that there is a big enough market for the OOT and releases it on DVD and thanks to stealing the bootlegers' idea and using the 1993 LD masters he makes the release only a little bit better than all the available bootlegs. Not only does this put a definitive end to any bootleg market for the OOT, it also gives him a chance to pull a massive double dip releasing the OOT as a bonus material to the previously released 2004 edition. Production cost of a 2 DVD release for each film? Close to zero. Profits? Doubled.
2010 A nice clean print of the original STAR WARS is shown publicly, proving that the original STAR WARS could look great in HD and leaving many fans with a bitter sweet taste in mouth.
Shortly afer BD release is announced but it won't have the OOT included, although GL seems less militant agains it.
Now, lets start guessing:
Not long after that a nice pristine print of TESB is shown publically reinforcing the effect of the SW screening.
Some time later a good print of ROTJ surfaces somewhere and gives fans another proof and making them hot with rage and determined to go and bring the message out there.
2011 The BD set comes out and makes enormous profits although it doesn't include the OOT and is the same master as the 2004 DVDs because the general public doesn't care as it is not even aware of these issues and thinks that the OOT looks like it did on the 2006 DVDs. But as it was proven by the more active fans that a great release of the OOT is possible, the official home video sites and magazines start a campain for it, slowly making the general public aware of this and want the OOT to be released. But GL still insists that an OOT restoration would be too expensive.
2014 when the seling potential of the original Blu-Ray set is past a new deluxe Blade Runner style release containing all versions of the OT films on several discs plus a new definitive making of documentary is released for each film separately for an enormous price and thanks to the general public wanting the OOT now, it sells gorgeouly and George doubles his profits like with every other previous format...