In regard to traffic and mass transit, the population is only going to continue to grow. Mas transit will help to alleviate the traffic from those who choose to use it instead of the highways. The traffic will continue, no matter how many lanes you add. If there is no mass transit, it is only going to get worse. In a matter of years MCO will have so much air traffic from international flights that they will discontinue flights to say Miami or Tampa. This only contributes to the highway traffic from those having to travel to other Florida cities. With high-speed rail, there will be an alternative that may indeed help take highway travelers away.
As far as light rail and developed areas, that's fine. They're already developed. But by blocking sprawl by preservation, it can only go so far.
I like your icon btw!