I don't think a reboot would work for Star Wars. The original trilogy was to good. And if we all remember correctly the Star Trek reboot is in an Alternate Timelime. If they hadn't done that I don't think if would have held up as well with Trek fans.
I wouldn't say too good. If that was the case, we wouldn't have so many version out there. I love the movies, but I think it was more because they came at a certain time. There is plenty of room for improvements in it. Not just better special effects, but better dialog. Lucas has never written strong dialog and I think a remake would benefit from a tighter script. At the same time, it those oddities in the dialog that we remember and enjoy quoting.
I think that a remake could be done fantastically with the same characters and major plot points. It would also be good to see an episode 4 where Lucas knew Vader's past and future and incorporated it more. He's the Emperor's right hand in 5 and 6 but that connection isn't there in part 4. I'd love to see what would happen if Lucas produced it and supervised a script with the knowledge that came later incorporated.
I just don't know if it would be magic and that's the risk. If it worked, it could be amazing. If it didn't, well ...
I already have a few people in mind for my casting.
Nathan Fillion: Han Solo
Derek Hough: Luke Skywalker
Russel Crow: Obi Wan
Julianne Hough: Leah
Igor Vovkovinskiy: Chewie
Shemar Moore: Lando
Vince Vaugh: Body of Vader