In much of the current way of popular thinking style is worth much more than substance. Since the cars aren't original San Juan pieces anyway, perhaps we might lay the historical (hysterical) arguments aside for a just few minutes. Lets ask instead, what would help attract, and bring back the "average" tourist?
A clean, attractive, well maintained consist? Yup, it could help. We already know pretty much what clean, and well maintained mean, but what IS attractive? Is olive Green attractive (would you want a pickup truck that color?)? Is maroon better? Tuscan? Yellow? brite Southern green? Lipstick Red(I won't call it what Jay did)? What about royal blue or 2 tone grey? Pick two that you like the best to start with, if you're still not sure what attractive means, ask your wife, SHE'LL have a few ideas.
Now take those two you picked, and critically examine: Which will be easiest to maintain? Which will stay attractive longer? (No, the paint question was not definitavely answered at the turn of the last century, modern paints and pigments have completely different qualities.) Which looks best in photographs (Don't forget that's the first thing many folks will see BEFORE they ever decide to visit)?
IMHO a nice dark wine red with black letterboards works well...that's what I'm using on my garden RR. My second choice was blue and silver, but it looked better on heavyweights than my Bachmann Jackson & Sharpe cars