Very ambitious proposal, for ordinary performance envelop. For racing purposes some have pushed those limits for ultimate grip with the help of vacuum fans instead of diffusers & huge wings. Chapparal 2J, extracts air from underneath, maintains constant low underbody pressure and achieves more road-handling grip. Another one, Gordon Murray's Brabham BT46B, combined all aero devices, a rear fan unit with canards & rear wings. It won its debut race but was then quickly banned. 100% winning record. His excuse is that it was an engine 'cooling' device, right.
Another evolution in ultimate racing aero is being developed by 2010 Constructors Champion, Red Bull Racing - Adrian Newley. Yes, it is vaporware but it is an example of a real F1 engineer's unlimited imagination w/o the current regulations. It's actual limitations are the driver's physical limits/abuse caused by its performance lateral forces.
Red Bull X1 Prototype Gets Real, Set to Debut in Madrid
As for 2010 FI 'moveable' front vent controversy, it really lowers top speed drag.
F1 aero updates, Bahrain | Formula One 2010 | F1 | Racecar Engineering