My ideal RPG: an 8-12 page booklet with a moderm infographic-style design that explains all the rules. All the reference stuff (monsters, magic, feats, classes, playbooks, you name it) as cards, bigger or smaller, depending on the need.

The goal would be to make it as accessible as possible, ideally to be picked up and learned in 15-30 minutes. Just like board games. Some publishers did try that in the late 80s, but it went nowhere.

If I get angry enough, I'll do it. 😀​

@tomo I've had discussions with people about if you could actually convey RPG rules using Graphics instead of words, I don't think it would work very well but I'd be interested in seeing someone make the attempt. the role-playing game I'm writing I'm expecting to come in at about 20 pages but I could probably get that lower if I simplified it a bit.
@Canageek
Unfortunately I have no design skills whatsoever. I would have to pair with a kick-ass (information) designer to do it. So it probably never happen.