Why not fix the aerodynamic wake?
How? (That's a genuine question, rather than just a dig). GP2 and GP3 have far lower levels of down force than F1 and they both suffer from the same issues of being unable to follow closely. GP3 suffered so badly from boring races that Kimi spent a day testing various modifications to stop the series descending into processions. WSR have had to adopt a DRS style system as well to counteract the inherent issues with winged cars.
The idea that gets suggested a lot is to just reduce the amount of down force F1 cars have, but the lower series having the same issue shows its not as simple as that. If you dropped F1 down force to GP2 levels you would have the same problems, just the cars would corner slower.
Its one of those catch 22's. Cars designed to manipulate the air to corner fast will struggle to follow other cars closely. Slip streaming works best when the front of the cars are like barn doors, punching massive holes in the air for the guy behind to benefit from. And when mechanical grip is as important, if not more important, than aerodynamic grip.
You could go really radical and follow the Delta Wing example (a personal favourate of mine, well, until Nissan killed it, stole it, and the turned it into a fraud) and push ground effects. But if 70's ground effect technology was making cars to fast to drive, what do you think 2014's aero boffins would be able to do with it!
The whole nature of single seaters makes it very hard to eliminate wake.