The invariance of the speed of light with respect to frame of reference is a special property. If something is faster than the thing observed to be invariant, which happens to be light, the geometry of special relativity breaks down, predicting spacial and temporal inversions. This isn't just limited to breaking relativity. Other areas of physics would break too. For example, this would also be a violation of the second law of thermodynamics. It doesn't stop there. Much of accepted physics would have be be rolled back.