This has been brought up numerous times and nobody ever comes up with a good reason as to why we need a new theme.
"This theme has been around forever" is not a good enough reason.
I think the idea of implementing multiple themes is a good idea, with a selector box in the user cp, but I don't really understand how forums work and don't know how hard that would be to implement.
I could care less what happens, all I know is that this theme is OK, and it might stay here forever. I don't care, it's an alright theme and it's easy on the eyes unlike some forums.