The fact that all the shuttle replacement proposals are basically copies of the shuttle or minor variants seems to be a much stronger argument that there's a real problem.
The space shuttle did not actually work - hence a new version that actually does work is the correct thing to do.
An actually useful space shuttle would be capable of frequent flights, say once a day, would not need crew to push the big button, and would land like the rocket it actually is instead of justifying NASA's air force affiliation with a few seconds of normal flight like a plane.
Since it would fly once a day, it would necessarily transport smaller cargoes to space: There just is not enough demand yet. So it would be capable of carrying one reasonably slim passenger plus his life support. Larger objects would have to be taken up in bits an assembled in space by a robot.
The current proposals aren't anything like this. They won't be anything that could fly once a day. They aren't proposing anything like that. The current proposed replacement will be able to launch if everything goes well slightly more frequently than the shuttle did. It won't be nearly as replaceable (crew launch will be an essentially Apollo-style system). The total lift mass will be higher than the shuttle eventually but not for the early versions.
The main systems that are coming from the shuttle are the shuttle booster rockets, and it would have a simil...
SIAI benefactor and VC Peter Thiel has an excellent article at National Review about the stagnating progress of science and technology, which he attributes to poorly-grounded political opposition, widespread scientific illiteracy, and overspecialized, insular scientific fields. He warns that this stagnation will undermine the growth that past policies have relied on.
Noteworthy excerpts (bold added by me):
In relation to concerns expressed here about evaluating scientific field soundness:
Grave indictors:
HT: MarginalRevolution