The Louisiana Boardwalk shopping center in Shreveport, less than half the size of the St. Johns Town Center, includes a small streetcar line to run shoppers from one end to the other. Anyway, I can't see why Ben Carter would pay for such a thing when shoppers will just drive from one end of the center to the other if they don't want to walk.
It won't happen because it would cost the developer money. There aren't many of them in the business of losing money.
It's too bad these stores aren't going downtown instead.