Kill it to save human spaceflight:
Simply put, the SLS program should be canceled now to free up approximately $10 billion programmed for this decade. This money could then be redirected to continue the planned flight tests of the Orion spacecraft with the much lower-cost Falcon Heavy booster while making a robust investment in a first-generation space station in the vicinity of the Moon. An investment in such a cislunar station would provide—by the early 2020s—a multifunctional platform to act as a fuel depot, a workstation for robotic operations on the Moon and a habitat to protect against the more intense radiation environment outside of the Earth’s magnetic field. This station could even be used as a habitat during longer-duration human missions to an asteroid and eventually to Mars.
Expect to see a lot more editorials like this as time goes on, new systems appear, and budgets get tighter.