Any invasive species has an ecological impact... A lot of my work has been on invasive plant species in hydrologically sensitive areas and it doesn't take much to throw weltand ecosystems out of whack. I believe there could be significant damage done by invasive snakes in the everglades, but like has already been said, there are already measures in place to prevent further escapes in that area. There's no reason for that to inform policies anywhere else in the country.
I'm not against hunting the snakes in the everglades, but I am against the big hunts that involve a lot of citizens. I could see a bunch of drunk people digging through the swamp to find snakes doing way more damage than the actual snakes.