It would take Hulk Hogan to heft my suitcase onto the roof of a golf cart. The taxi drivers can hardly get it into the back of the van as it is.
That said, it would be nice if the number of motor/gas vehicles was limited and decreased as they go out of service or go back from whence they came. However, how do you take away a taxi driver's new van, etc.? It's just not that easily resolved a problem.
After it rains, the roads are always all potholed and gouged. The trucks come along and spread more sand and it gets graded again or tamped down. Would they do that with the golf carts too? See, it's tricky.