Reasonable on 15 June 2009
Sounds interesting, but really what ever happened to 'easy, medium, hard, insane'?
Also, while this solution sounds elegant, in most cases difficulty spikes are the result of a balance issue with the game design, and I'd hope that identifying and removing these during testing would remain a focus also (i.e. the problem with this solution is in some ways it covers for game design errors).
Try to be reasonable... its easier than you think...
