Jack says:

"Could be that dark matter & dark energy go the same way as the Luminiferous Aether..."

Jack, you may be right, but to say this in professional circles doesn't make you very popular. There is lots of professional, emotional, and not least financial investment in dark matter and dark energy. But there is certainly a similarity between the situation of cosmology today, with ever increasing complexity being invoked to preserve a favourite paradigm, with the late 19th century leading up to the Michelson-Morley experiment, and even slightly after this before the formulation of special relativity in 1905.