Do you think they'll ever fly again?
Why not contract with the Russians and build the Clipper, use Soyuz until then.
And think of a polite way to de-orbit the ISS.
Or, fly an aging Shuttle fleet until the next one goes, and then scrap them. Along with the Clipper.
(Wonder how many Shuttle flights cancelled it would take to pay for the Clipper?)
At least that's how it seems from right next to the ground.
Arf