Purple wouldn't work? That's all TMK used to be: black and purple. Thank goodness those days are over.
Anyway, if you realized just how big TMK is, and then realize that a fair amount of the design was hard coded (since it was designed before CSS was widely used), you'd understand the sheer amount of work that would have to be done: every single page changed. That said, we are working on updating certain parts of the site, but it will be more of an evolutionary than revolutionary change. We'd rather give you content than asthetics, and the asthetics aren't half-bad anyway.
With Nintendo pushing retro themes, why can't this site stay retro?