Failed to take time into consideration?

"Well I think that, ultimately, everything is potentially testable and verifiable or debunkable. We may currently lack the understanding or expertise, but we can predict that the testability will one day be possible..."

Care to tell me how that fails to take time into consideration?

The delicious appeal of science is that enquiry is never-ending. If humans go on for another million years there will still be unresolved mysteries, and that's how it should be. Your molecules example doesn't stand up. No-one suddenly come up with a wacky, unsubstantiated claim that "molecules exist." There were all sorts of pointers already in place in the study of the behaviour of chemicals. Clues to be pieced together, in some cases clues that didn't present hemselves as clues until a brilliant mind unlocked them, tests available to provide corroboration. The whole of our accumulated knowledge about the particles of matter has been gleaned from scientific enquiry, the gathering of evidence, a stepwise process full of checks and balances. Inventions of human imagination that trump the laws of nature can't go through that process. There is simply nowhere to go. One hundred percent of the burden of proof falls on the shoulders of the propagators of those notions. Crowing that I can't prove that you're wrong is tedious, boring and a waste of time. I don't WANT to prove you're wrong.