MACHOs vs WIMPS, the Asimov debate
As mentioned, we now have better data to test the theoriticians ideas against. In science, debate does not prove anything but it does stimulate new ideas and motivate experimental efforts.
So, what did happen ~6 billion years ago to kick off the acceleration of expansion?
These are exciting times in the 13.7 billion year history of the universe.
-p (found the 1st 13,699,999,950 years boring)