Never underestimate people.
Despite the glaring obviousness of human stupidity, which is made far more accessible by the internet, we are getting smarter and smarter as a race.
I think more people would understand high end science, at least in principle, than you would believe.
While they may understand the basic principle of "speed of light slowed," they probably don't understand the implications like a person with a degree in astrophysics would.
It sounds cool and all, but it's outside my wheelhouse (and most people's wheelhouse.) I'll leave it to somebody with more understanding of the topic to explain it to me.