Lucas dying will be like when Michael Jackson died. Everyone, including many of his admirers, had a problem with his professional and personal endeavours but once the media circus that was his life ended and his music was no longer tied to all that, suddenly everyone realized why they appreciated him and his work in the first place. When Lucas dies, people will forgive and forget about Jar Jar and Howard the Duck because they'll be too busy crying over all his technological and philanthropic contributions to the world, and all the films he made that we love.
Except if there's no original Star Wars. Then people will say, I wish I could appreciate him for the work he did, but all he'll let me have is this crappy tape from the early '90s.