The Family Edition's problems were IMO partly structural and partly self-inflicted (with a dash of bad luck tossed in). With that many contestants running around, often not referred to individually by name, it's difficult to get to know em and relate in any way to them. (I still can't name any of the Bransen sisters, and they finished the race!). Also, so few teams relative to the number of legs led to a loooong time wandering around the west without an elimination.
As to that route, TAR Canada showed me just how compelling a journey that never leaves a country could be, and such a route mostly in the USA should have been at least as interesting. Instead we got the world's largest office chair and the a red Lodge Mountain Golgotha Course.
We'll not see another family edition. But if the producers were for some reason determined to make it work:
1. Make it a completely separate "series"' like the international versions. That might reduce unflattering comparisons with the original. maybe a summer series, although Big Bother seems to claim much of the CBS summer timeslots.
2. Spoilers be damned. Pick the most interesting route, regardless of who might spot the racers along the way.