Urban fringe on the move?

The swamp doesn’t end at Big Cypress National Preserve.

The photo below was taken in a helicopter at about 500 feet in the air near the preserves northwest corner and looking northwest and shows just that: It’s cypress as far as the eye can see.

Bear Island below and Ave Maria University
off in the distance on the right.

Or is it?

At some point the swamp runs into civilization at a line in the sand called the urban fringe.

Is it me or, over time, has that line moved?