To be honest, if the Gen V ACR can't beat the Porsche 918, it wouldn't keep me from buying it. I'm not going to make any money from winning races on the track, and I want something that I have fun with - at a reasonable price. If I crash a 918, that's like crashing a mansion. If I crash a Gen V ACR, that's akin to crashing a condo. Both will be painful, but I think I'd feel free to have a lot more fun with a Gen V ACR than I would with a fully optioned 918. I'm just not in the kind of league to have fun with a $1M car.
The key is to have a car that handily beats the Gen IV ACR and the Gen V TA in my opinion. I loved my Gen IV ACR - and I'd love to see a Gen V ACR that was more insane. If it had a new engine (direct injected with 730HP+), active aero, carbon/ceramic brakes, heavier clutch with better feel, stripped down interior with real race seats, manually adjustable race suspension, titanium exhaust (rear exit preferably), new ultra-lightweight exclusive wheels (Sidewinder III), some ACR-customer-specific paint choices, and "electronic crap delete" option, I'd be all over it. In fact, I already have a "new ACR fund" established to get one if it comes out.
I'll never buy a Ferrari, I'll never buy a Lambo, and I certainly am not going to pay $1M for a Porsche - when I buy a crazy-car, it's going to be American built and have all the nuances of an American built car. Call me crazy, but there's a cultural thing involved with buying a Viper. They're just plain old fun - not the most refined, not the easiest to drive, and some people don't appreciate them. But, they are a kick in the ass and they make me happy. You just can't put a price on that.