As a player, I'd be fine with it. They had a shuttle between 9-10 at the Ocean Course.
Obviously, this would only work at high-end daily fee courses, but most top unwalkable courses are in fact high-end daily fee courses.
I think it would be doable at a medium level course as long as its only in 1 or 2 spots. You'd only have to pay one extra kid per shift to do it...
Plus more employees to hire,administrate and maintain a caddie program......plus build a suitable caddie waiting area......etc. etc.
minus the revenue from carts
the bottom line for most courses is already unworkable and cannot sustain additional expenses