I think it's a very good idea to let anyone willing to be screened into the boarding area. There are any number of reasons you should support this change of procedure:

1. The parent escorting child exception has age limitations in some cases and is not allowed at all in some locations, including my home airport. It just makes no sense to have unsupervised children wandering through a busy airport alone "to ensure better security".

2. The families of travelers and travelers themselves will be happier if they are allowed the option of staying together until the flight leaves. If I've had to say goodbye to my family at the security line and then face a two or three hour delay that I'm only informed of once I reach my gate, that's two or three hours of together-time I'm cheated out of.

3. The lines ain't that long. Only once in my twenty most recent flights have I seen a wait longer than 15-20 minutes. Fine, if there's a real crunch, temporarily suspend non-ticketed screening.

4. The huge crowd of people meeting travelers all bunched up at the security exit is annoying. In my home airport there's a narrow hallway that gets completely blocked by Aunt Edna hugging little Joey while their luggage sprawls across the walkway. Let these reunions happen in distributed fashion at the gate where everyone isn't in everyone else's way.

5. (flame bait) Almost no frequent travelers believe this security screening nonsense anyway. It's just very expensive psychotherapy: makes people feel safer but doesn't make people safer.