The idea of Star Wars VII doesn't fill me with joy.
On the other hand, I can pretty much guarantee it won't be the worst Star Wars film ever made. It'd have to compete very hard to win that crown. That said, I think it runs a considerably larger risk of ruining some characters I'm very fond of than the prequels did. Because what is a Star Wars sequel without Harrison Ford? And the fourth Indiana Jones films suggests that for the right money he'd be up for it. But do I really want to see an old Han Solo? Not really.
Disney, in many ways, seem to be the ideal owners of Lucasarts. They have some experience in dealing with the franchise (the Star Tours rides at Disneyland, for example), they are experts at merchandising, which has been a large part of the Star Wars world since the very beginning, and they've done some good work in the last few years in regenerating some franchises that had lost their way (for example, through their purchase of Marvel).
Finally, to hear the way some people have been talking, you'd think that the Star Wars universe had been entirely unsullied by thoughts of money making up to this point. If this purchase does nothing other than taking Lucas himself from the centre of the film-making process and lets a few other people have a go, that alone could make the whole deal worthwhile.