If there was ever proof in the pudding that we should not be going back to a capsule, and ishould nstead focus on creating the next generation Shuttle (lighter, better, faster, stronger), the Hubble Telescope is that proof.
If it were not for the Shuttle, Hubble would have been a dead duck after day one (remember the messed up lens right away?), and Hubble's upgrade/repairs would never have happened.
Our technical ability to travel around in LEO and fix things, plus jaunt back and forth to the ISS for scientific research, is a clear indication of our need to move forward with our spacecraft, not backwards. Every time I think about the direction we're going, I need a Tylenol.