Is there anything more controversial in life than "other things being equal"?

Is there anything more controversial in life than "other things being equal"?

"If the price of milk falls, ceteris paribus, the quantity of milk demanded will rise."
?

If we define dark energy as the observation that the expansion of the universe is accelerating, I might consider a bet on that vs. dark matter. In other words, you win if the astro-physics consensus becomes "the expansion of the universe is not accelerating" before the consensus turns to "there is no dark matter" or remains at "there is dark matter". I win if the reverse order occurs: the consensus becomes "there is no dark matter" before there is any change (or no change) on the dark energy consensus. And nobody wins if some other combination occurs or we can't agree on the consensus. Say $100 with, say, a five-year time limit?

Tempting, but there is a much bigger scientific community now sceptical to dark matter, than dark energy. In particular the  MOND community is growing 

Dark Matter May Not Exist: These Physicists Favor of a New Theory of Gravity

On other hand I and some others have some more strong cards coming in favour of Lorentz relativistic mass that could make dark energy fall before. So yes I take your bet. Wednesday Nov 2, 2027 we make it up. We are naturally both AAA so no margin collateral.

I could be losing this bet with Espen:
Dark energy 'doesn't exist' so can't be pushing 'lumpy' Universe apart