A thought experiment: assume that reality is described by the phenomena associated with experiments on quanta. Next, discard all results from classical physics and construct a topological space out of the objects solely of relevance to the quantum world together with functions defined in this space and describing non-locality, superposition, 'real' randomness and unpredictability, etc... if possible.
Conceivably, that space could have an internal structure or logical pattern alien to our notions of cause and effect, finite speed of light, action at a distance, etc.
Next, attempt to incorporate, by degrees, the entities (particles, forces, etc.) from conventional physics. Might a GUT emerge, vastly different in formulation (unrecognisably so) but more felicitous in accuracy of prediction of physical phenomena?