If LIGO/Virgo succeeds in detecting gravitational waves then Ron Hatch is debunked in favor of Einstein's General Relativity. If LIGO fails then Hatch is vindicated and Einstein's theory fails.
It is really that simple. And most physicists believe that LIGO will succeed.
Again, every meaningful test indicates that gravity propagates instantaneously to within our ability to measure. That does not sound like a wave to me...
http://metaresearch.org/cosmology/speed_of_gravity.asp