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The real problem with string theory is that it is not testable by experiment at this time. The high energies needed to show structure at ten to the minus forty+ power in length are far beyond our current accelerators. Unless the theory can come up with something predictive and testable it remains what it is a theory. Observational cosmology may give some insights. Nevertheless conjecture may point to the truth it just takes time and effort.
Of course the other way this theory can be shown to be correct is to predict from It's first principles the masses, charges, spin etc of all the elementary particles and all the Universal Constants. Never mind this very weak thing called Gravity.
I personally think that since everything was once in the same place and time (the 'singularity?' before the big bang) hence that all 'particles' are forever entwined or linked (see Einstein action at a distance or Quantum entanglement) there is something that is connecting everything that exists through space AND time to everything else through space AND time. I wonder if gravity is an indicator of these connections.
My guess is as good as any other guess. The test is, is it testable!
Bert
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