Quite right. Space-like and time-like dimensions in Minkovski space have
different properties. We are not dealing with a standard Euclidean space
here. This is indicated by the negative sign applied (solely) to the time
dimension in the metric for space-time, and by the related fact that we
speak of the arrow of time but not the arrow of space.
Notwithstanding that I agree with Moorad about the inapplicability of
George's argument at this point, I'm not convinced that there is any
evidence that 'c' has fluctuated. So in terms of conclusions I'm with
George and Glenn and co..