@FBM,
Quote: If there are a handful of speculative and contradictory hypotheses punted around, that's all for the better. The more imaginative, the better. They point others in new directions to explore and consider.
Sure, I agree with that completely, FBM. But that wasn't my point.
My point was that much of this "speculation" is inherently unverifiable, and hence in no way "scientific." How, for example, would we test the claim that there are thousands of alternate universes "out there?"
Such suggestions are made in attempt to meet MATHEMATICAL desires, not because of any empirical evidence. Theoretical "physics" has largely become math, as I see it. Math can "prove" anything, if you're naïve enough to think that math is physics and that math can "prove" things.
Math often "proves" too much. I'm told that string theory, employing 11 dimensions, in fact leads to an almost infinite number of different solutions to the same "problem." How could you ever pick, on the basis of math alone, which one best fits "reality?"