Losing its shine?

Dark matter is an established postulate. It needs to exist in order to explain the motions of galaxy clusters. Undetected to date, its existence has been somewhat the preferred option to modifying General Relativity’s version of dynamics. However are we seeing the start of a dark matter mood shift? Older universes seem less reliant than expected on dark matter and galaxy rings are showing anomalous behaviour. Will Einstein have to join with the dark side? Or will the force be with him?