There's lots of non v8 motors running in FormulaD this year. Not sure where you're getting your info from.
I also don't understand why people hate on V8s so much. If you got rid V8s, everyone would be running either I6 or I4, maybe a few boxer 4. I think it's actually kind of funny how some people seem to desperately fight against V8s, even though it's very clear they are one of the two best motors for drifting. And for an amateur drifter, there really is no better motor in terms of power, torque, ease of maintainence, and reliability.
I guess I just don't understand why people think that drifting with a certain type of motor makes the drifting either less or more impressive.
And as far as GT5 goes, "everyone" is using hybrids because they are new. Most of us have been playing this game for a few years now, so we're quite bored with the regular Supra/350Z/370Z/SS10 that we've drove for literally months straight, if not years.