My only worry is that all different class versions will cross-pollinate each others and we might end up with very "streamlined" classes having lost most of their edges and quirks. But edges and quirks are what make this game great!
I would simply add that caveat: each version is a "definitive" submission, no excessive tinkering allowed (but each forumer can post more than one).
Does it make sense ?
I think so... I'd like to see how people can take a class like a Bard & Barbarian, and really differentiate them from Warriors & Thieves. I'd like to see a Gnome & Half-Orc. I think that's the "challenge". It's too easy to make a class that's a "bit" of Warrior, by using MDoA and a bit of "Thief" by co-opting a their skill charts. But I think this is an opportunity to try out a new class specific sub-system, especially with all those funky dice. It really shows how solid and flexible the core classes are.
What I worry most about is Power Creep. Almost all new spells & classes, that have been posted, have shown a bit of this. I don't want what I saw in 4e, where Warlords & Avengers were better than Warriors & Clerics.
I think some interesting things can be done with Bards, Gnomes & Half-orcs (as I've mentioned, I really like the Vanguard's Orc, and it could be toned down a bit an be a really interesting Half-orc.)
_________________Reverend Dakota Jesus Ultimak, S.S.M.o.t.S.M.S., D.M.(Dungeon) Master In Chief of Crawl! fanzine. - http://www.crawlfanzine.com/
"[...] there is no doubt that Dungeons and Dragons and its imitators are right out of the pit of hell." - William Schnoebelen, Straight talk on Dungeons & Dragons