Nah, Quark was never really that bad to begin with.
You mean, someone who really should have been made to confront his past and his actions in the present and realize that his way of doing things was wrong and that things will end horribly wrong if he continues like that? Dukat. Or Enabran Tain, if you want someone closer to Scrooge's age and as emotionally closed as he was. Heck, I think there were probably lots of people in the Cardassian Union who needed a few ghosts of past, present and future to pester them... might have prevented some things... if it worked.