I'll probably make a low quality, dial-up friendly version too. ;)
It's probably really unnecessary.
If the game is worth playing, it's worth downloading. For dial-up users, this means having a flash drive(ten bucks for a good one) and going to the library or a friend's house. It's not an issue.
Any top-down sprite-based MMO will be pretty bandwidth un-intensive to play once you have the game files, so it's not hard to include even dial-up users; I know I've played successfully on Kano's MMO betas with my really really crappy connection(about 5 kbps).