Problem is, you can't "forget" progress. You can ban semi-automatics, you can ban various additions - but you can't "forget" advanced aerodynamics. The only thing you can do, in this case, is force engineers to work with new, purposely inefficient designs, and hope they struggle for long enough - this is what the 2009 regulations hope to achieve (and already failed - most teams report just 85% downforce lost!).
I don't think F1 needs more power, either. As of now, it's the most powerful lap-based series running (Dragsters don't count), and with the weight these things have, they're also some of the quickest and fastest in every aspect. IndyCar fans like to boast about their higher speeds, but should F1 ever run a race on a Superspeedway, speeds could easily pass the current Monza record of 360km/h.
At the same time, tracks like the Nordschleife will never return to F1, since they're plainly dangerous, and would also make for some terrible racing - how exactly will they pass when they barely fit two cars on a straight, and going off would mean a high-speed encounter with a tree? I also don't see why Laguna Seca is more difficult than, say, Spa Francorchamps. Or even the Gilles Villeneuve circuit at Canada. There's one difficult corner, but once they nail it down, it'll be as easy as every other corner on any other track.