The solution here is simple, and one that Southwest ought to have implemented:

1. require all people to get a "gold card" in order to enter the security line.

2. you get a "gold card" before going to security, and you can't get a "gold card" until, say, 1.5 hours prior to your flight.

3. Southwest is clear when you make a rez and on their website that you cannot enter security until 1.5 hours, so DO NOT get to the airport too early.

3. you get the "gold card" outside the terminal