I think one of the worst parts of the retcon was that they made Obi-wan Kenobi into a liar, because he said Skywalker senior was killed by Darth Vader, which they then changed to be false.
My greatest wish for the Star Wars universe is this: Complete reboot and re-shoot all the movies as realistic animation. That way you can stay true to the original three movies (while fixing a few things and perhaps updating the technology somewhat) and you can have a young Han Solo, Luke Skywalker, Leia Organa etc for their adventures. They could still do the voices.
The EU has some great storylines you could make into movies (and many very silly ones we better ignore), for example the Thrawn trilogy.
Personally I think it would be a disservice to the fans if we never got to see Luke meet Mara Jade, if Han and Leia never got married and their kids never existed...
Speaking of retcon, the prequel movies (*hissss* Take it away!) contradict some of the EU novels, for example when it comes to the origins of the Death Star. That's something they could clear up as well. Better prequels would be awesome. Right now they don't make sense at all. Hey, Kamino cloned an army... where did they get the necessary resources on their secret, hidden planet? That would have left a paper trail a mile wide.
Let's say they managed that... where did all the Star Destroyers come from? The armor and weapons? All the vehicles? The Republic didn't have them and they sure as hell would have noticed if someone amassed an arsenal for an army.
Here, my contributions to silly questions that keep you up at night. 