Granted a 60hp rally car wouldn't have nearly the acceleration of its higher powered peers, but on the upside I'd bet that whoever drove it would never have to let off the gas in the corners... that's what made the Mini so popular.
Okay, so I'm kinda reaching with that, but at least you gotta give them credit for trying something new. Considering there are Neon rally cars out there too, it wouldn't be too much of a stretch to think that a few other compacts and subcompacts would be tried out eventually.