Including hints at all the damage that would be done to the Traveller narrative. With jump drive, all those interesting little "nothing" worlds become important because more than likely, you don't have a ship that can skip them. With hop drive, you jump over large swathes of "inconsequential" interstellar territory. You could argue that it just changes the narrative, and doesn't destroy it, but it'd be very different.
I like the idea of running a campaign with instantaneous interstellar communication, too, again greatly changing the typical Traveller "age of sail" narrative, but it could be a fun experiment.