It is kind of looking like the prize for Dark Energy was awarded for a nonexistent phenomenon. The dust hasn't settled, but it will or should be very embarrassing if it turns out so.
This noted, I've been under the impression for a while that dark energy/dark matter is more likely a detailed accounting error. That is, it's likely that it is not a "new" thing, but old physics that we have an incomplete understanding of.
Science is funny that way. Early results considered groundbreaking are refined and extended over time. And sometimes, as we gain more information and comprehension, the effect we think we observed is subsumed into "boring" physics (this is how it was described to me by a friend).