I think you are losing sight of the fact that markets are relative. Just because the Viper has a "lot of power" doesn't mean ANYTHING for bragging rights when it is surrounded by a sea of similar power numbers these days. Since the Viper isnt at the top of the Power Pile anymore, it should have had a body to die for like the GTSR to at least make it even more unique and not just look like a retro version. This is great for the Gen-2 nutswingers that havent let the Gen-2 body design go, but it does not help any of us progressive types that wanted to see a body evolution or revolution... not a leap into the past.
Power wise, I for one expect that this car will be severely underrated. However, I also think that it was a bad move for them to do so. These days, numbers sell cars, and they should have displayed such. With how easy it has proven to be in the aftermarket to move the Gen-4's into the 700+ range and still remain "test-ably compliant", there is NO WAY SRT could not have done the same. I understand all too well the problems of emissions compliance, but it is not rocket science for an OEM to make a few changes like that.
You are also forgetting that a "concept" is what takes all of the development costs- it is CHEAP by comparison to copy it! They already have the GTSR body, and they will already be producing its parts. It is not a big deal to mass produce something that is already in production and designed. I would say that the response is more than "there" on the topic. Everyone loves the GTSR, and the regular body has been luke-warm. Any intelligent group of business officials would produce the car that has the most appeal to buyers they hope to sell to. These are basic business concepts as well. Manufacturers regularly forget this while trying to fit projects into certain budget constraints, and it becomes a "well guys, we have to lose the widebody kit so we can afford the new interior". Where is the guy in the back of the room saying "Are you ****ting me?!? Why not charge 1K more and give them BOTH. We aren't making a Prius here guys, and we already have the bodywork available!"
The Viper is not and has never been a car that should be built within a strict budget- it should be flexible based on response.