Further watching: http://www.imdb.com/title/tt1325014/
With that being said, the image quality suffers from horrible smearing caused by 1993-era DVNR and colors are severely desaturated. Furthermore, the release was rushed and reeks of an inexperienced restoration team. For more information, see: http://savestarwars.com/gout.html
It is held by many to be the worst DVD release of all time.
Many different early-generation film elements exist, such as internegatives and interpositives, all of which are capable of yielding resolutions much higher than 2K (or even 4K) with the right equipment.
Furthermore, many hundreds (or even thousands) of the theatrical 35mm and 70mm film reels still exist for all three films. (They're in the hands of private collectors and LFL.) Sure, they're beat to hell, but a restoration team worth its weight should be able to handle such a job if the situation were so dire.
For more information, see http://www.originaltrilogy.com/ and http://www.savestarwars.com/.