First I want to apologize for my bad english and my almost non-existent knowledge about the world of F1.
Im just a casual F1 spectator and I want to say that the F1 sound is one of the most recognizable aspects of the sport. If you say somebody "hey, listen this engine". He/she will automatically say "that's a F1 car." It is so distinctive from every other thing in the world. The sound is F1's trademark.
So, Im not sure about what Im going to say, but, if turbos are back, the engines will be smaller of course -they dont want 4000 hp engines-. Maybe 6 cilinders and 2.0 L or something like that. But, what about our precious sound? And the revs, they will be smaller too?
I dont want to offend anyone but I dont want this sound for F1:
http://www.youtube.com/watch?v=nEjkjQam6_A
or
http://www.youtube.com/watch?v=Ys4ukHDIvZc
I want this -or similar-:
http://www.youtube.com/watch?v=aBXUOomynxw