It won't be "some guys at truck stops" who will be the first users, it will be rail and corporate long-haul truck fleets, and possibly some large urban fleets (transit buses, schoolbuses). This is a great deal more than "people talking about what's about to happen". Money is already being spent to "make it happen".
But come on, guy. Over 50 yrs don’t you think money was being spent? It didn’t happen. Compressed natgas is a fraction of energy density to diesel.
Look up the range of a CNG Honda Civic vs a conventional Honda Civic. And note you give up the CNG’s trunk to have even that inferior range.
Oil became oil for a reason. Physics. That doesn’t change.