True but
You are then dependent on a foreign nation (as the US is currently) for manned access to space.
The US will fulfill it's obligations to finish ISS baring another Shuttle catastrophe. We'll just use the Shuttle to a bare minimum. Any of the ISS missions originally meant for the Shuttle that can be done differently will be done differently.
The US CEV will likely be able to bring 6-8 crew members. The Ruskie Skipper will do the same. Crew sizes will not be a problem for long. I think ultimately the ISS will be serviced by private space craft, along with Bigelow's space station.