There are alot of car companies that use turbo's in there production cars in North America
Mazda 2.3L Direct Injection Turbo
Pontiac Solstice GXP 2.0 L Turbo
Porsche 911 Turbo (3.6 Twin Turbo)
Mercedes Benz B200 2.0 L Turbo
Dodge Nitro/Caliber SRT 2.4 L Turbo
So there are companies that use turbo's in non-diesel applications. In North America it is predicted that there will be more cars with Diesel, I believe 15 percent of the market in of cars in North America will be equipped with Diesel engines. Audi and Peugeot use Diesels in there racing programs, so why not in F1?
Sawtooth spike mentioned that each race should be there own in regards to engine reliability. But before the engine change rules, Teams would introduce new engines at each practice and change them for a new engine for qualifying. That is not cost effective to have so many engines that will be used so little of the time. Wouldn't the introduction of improving engine reliability be a wonderful task for engineerings to work on ?
The last thing is a question, DTM in the 90's, did it not go bankrupt because of spiraling costs ? And with are not all DTM cars now have the same bodywork like Nascar and Aussie V8 (could be wrong about the Aussie thing) ?
Again no personal attacks just stated my opinion, I like to hear some other opinions for and against

Simon: Nils? You can close in now. Nils?
John McClane: [on the guard's phone] Attention! Attention! Nils is dead! I repeat, Nils is dead, ----head. So's his pal, and those four guys from the East German All-Stars, your boys at the bank? They're gonna be a little late.
Simon: [on the phone] John... in the back of the truck you're driving, there's $13 billon dollars worth in gold bullion. I wonder would a deal be out of the question?
John McClane: [on the phone] Yeah, I got a deal for you. Come out from that rock you're hiding under, and I'll drive this truck up your ass.