Like others I wouldn't chance it. I have a cruise that docks in Port Everglades and have a 2pm flight out of FLL. There was an 11 am option but I didn't even want to chance that as there are too many variables.
As mentioned the biggest issue is getting to the airport, then the security at the airport. Also, who knows what type of new security they might come up with at the airport in the future. The TSA could suddenly change the rules/guidelines and require everyone be at the airport 2 hours prior to all flights with no exceptions or have more intense screening procedures that could really delay you if you arrive with not much time to spare.