I think IndyCar is a big mistake. He's got nothing left to prove there and its still the most dangerous series in racing with a talent pool that's going lower and lower, two things that don't mix well imho.
I recall an interview with Danica Patrick before NASCAR where she also dumped on the GT3 "too twitchy, makes you hessitant to put the power down". She wasn't too hot on the
driving this Murcielago either.