It sounds like the Everglades are on the way to becoming a single-species (well, maybe two or three) desert. Pythons that have escaped or been dumped when they got beyond the cute stage are growing big enough to eat deer and alligators.
There are lots of places for them to hide out. I suppose when they've eaten everything else they will start eating each other and will have a population crash. They don't seem to be easily captured.