Sooo?
Let's look at that.
Florida is, based on the 2012 data illustrated, netting about 110,000 migration entrants a year. That would be about 440,00 over four years. Over a million every ten years...which is slower than any ten year growth in Florida since 1950. And about 1/3 of the grwoth between 2000-2010.
But even that rate, over time, creates a tremendous population growth since the population of the state will continue to grow by having children.
There are only three factors in population growth..birth, death, and migration. And the additive effect over several decades can be significant.
Although to you young guys, 1970 sounds like a story from long, long ago, in a galaxy far away...I was in college still. And Florida was a sleepy little state with 1/3 of the population that it has now.
The import of this is..that in this year or next, Florida's population will surpass that of New York.
And between 2000-2010 censuses...who is growing?
Of the 15 most populous states in 2010:
Growth 2000-2010
Texas...20.6%
Florida...17.6%
Georgia...18.3%
N. Carolina...18.5%
Virginia...13%
California...10%
Washington...14.1%
Michigan... -.06%
New York...2.1%
Illinois...3.3%
Pennsylvania...3.4%
New Jersey...4.5%
Massachusetts...3.1%
Indiana...6.6%
Ohio...1.6%
The OP's premise that the growth does not result in a proportionate sheer number of fans is correct...but I assume that the numbers of fans will increase at the same rate as the population....thus Texas sports fans have probably increased 21% in the decade of 2000-10, etc.