I like the idea a lot, yeah!

Even if I actually enjoy tanking, being DPS doesn't exactly dislike me, and I suck healing.... It would be really fun to have such a random selection... Maybe an option similar to "Join a party in progress?" a square we decide to mark or not. Would be super fun...

"Oh, I'm sorry, game decided to send me here as healer... Well, no problem if you people die! I have raise!...Just ask me for use it"