We know that, in its current form of the $SU(2)_L\times U(1)$, the electroweak theroy rides a wave of huge success. However, is it not possible that the correct simple group unification could reveal physics that the current model doesn’t?
For example, it could reveal the existence of a unique gauge boson, like the photon for EM ('EM-photon') produced by $U(1)$ invariance, which might be called the 'EW-photon.’ This EW-photon, with the right group structure, could then produce the $W^+,W^-,Z_0$ and the EM-photon and the known physics at the E-W scale?
Does anybody know whether there is any activity on this, other than Technicolour? Links will be greately appreciated.