You are sadly mistaken. There is no Orlando and its forward progress without WDW.I have traveled between Orlando and Tampa many times on business. Orlando isn't the only tourist spot in Florida.
The planning for rail between Tampa and Orlando has already been done - was part of the 2000 and 2009 proposals. And that included the necessary survey of land, along with legislative authorization to purchase the Central Florida Rail Corridor from CSX.
It's a little over an hour's drive on I-4 between the 2 cities. There are people who live in Georgia and work in Florida. I know because I've worked with them. And most have a good 45 to 50 minute commute each way - and not on an interstate.
And Miami isn't just a tourist destination. It is a major artery to South America via plane and ship. And an international banking center.
And there is more to Orlando than just tourists. Try visiting downtown. Observe the names on those buildings.
There is more to Florida than Walt Disney World. Why else would it be one of the fastest growing states in the country?