There is one model, I think it is the Eclipse, that list at $750,000 to $800,000, which is less than a new Baron with the same performance & less maintenance cost.
The only downside I see is the FAA requires a type certificate to pilot any jet powered aircraft. (Not that big of a deal, but it could be a pain in the but if several companies start making light jets)
I read carefully the description in the monthly AOPA and could not confirm these things are intended to be single pilot airplanes--they tell you that they have done a lot to simplify flying them but they don't come out and say they are SP although I assume they are.
Nobody seems to make much of the type cert problem--you go for a ride with the chief pilot and he signs you off. I suppose at the point you own one of these, the initial type cert requires you to learn to fly it but you would presumably have only one kind of airplane. The real operator limitation is imposed not by the FAA but rather by the insurance company--by the time you are insured when you are driving, the FAA has long since signed off.
I have not sat down and figured out the cost of using one of these as a substitute for commercial air transportation. It is guaranteed a lot less than your Gulf or Citation.