I remember a flight from NAS to LUX back in the 70s when, due to fog, we diverted to FRA. At FRA pax were given the choice to either get off and make their own way by ground transportation or wait it out with the crew for a wx improvement at LUX. It was also made clear that if wx improvement didn't come about within the next x hours (can't remember the exact figures) they would be transported by coach to LUX. The point was that pax were given a choice.