I'm a graduate student in astronomy and I think it's extremely unlikely that dark energy or dark matter will go away. The concern of an "error cascade" was legitimate when these ideas were first proposed and many astronomers were skeptical of both dark matter and dark energy for long while. But over time there have been a number of independent lines of evidence pointing to the existence of both dark matter and dark energy. It's possible some comedy of errors could have lead to the spurious detection of dark matter or energy through one of these measurements, but very unlikely that it would be mimicked in other, independent measurements.