Anakin: In my view, it’s the observations that are wrong!

Dark matter (WIMPs) has a lot of known issues, the largest one being that we should probably already have seen it (but not certainly, we just excluded almost all of it, not all). None of those is strong enough to really kill the theory, it is still the best one we have, but to firmly believe in it is something else.

But yeah, AFAIK the judge is still out on whether this is even a change from the previous model or we just calculated things wrong.