"It seems unlikely that NASA will receive significant budgetary relief in the foreseeable future," the three retired astronauts wrote in a May 4 letter to Wolf. "Consequently, it is mandatory to maximize return on the limited funds available to access low Earth orbit. An early downselect would seem to be prudent in order to maximize the possibility of developing a crew-carrying spacecraft in time to be operationally useful."
NASA: Competition at core of commercial crew program, Spaceflight Now
"Ed Mango, manager of NASA's commercial crew program, said Tuesday a "downselect" to a sole company could double the cost of fielding a privately-built human transportation system. "We need competition as long as possible. The price to go with one [provider] starting today, and then all the way through certification and into services, is at least twice what it would be if you had competition at least as long as possible," Mango said."