I engaged in academic debate from the expected APS position over this very topic in 1987 with a gaggle of recreation planners and landscape architects.
The idea has been floating around for at least 25 years, and I've seen it floated every 5 years or so since then.
The most convincing arguement presented was - "Well, people with RVs may want to visit the city while on tour."
Okay.
To each their own.