Given that GA tends to be held in what my mid-atlantic self views as weird corners of the country, doesn't almost everyone who attends GA fly to get there? Don't they need government issued ID to get on the plane?
As for the youth, at least in Virginia, if you're under 15 your mom or dad brings your birth certificate to the DMV, they fill out a form and pay ten bucks and you have government-issued ID. If you're 16 or older, you probably have a learner's permit and if you don't the procedure to get one is as simple as the one for the ID card.
I get that some un-documented immigrants* can't attend GA if government-issued ID is required, but honestly, I'd say the $300+ entry fee and the fact that GA is entirely in English would be greater barriers than getting ahold of a half-convincing fake ID, and the entry fee and English-language have been a fixture of GA since its
I guess what I'm getting at is "Enter, Rejoice and Come In as long as you have $300 and speak English" really THAT much more welcoming than "Enter, rejoice and come in as long as you have $300, speak English and have government-issed ID"?
* I've only known three people personally who were in America non-legally, and I know for certain that all three of them had drivers licenses.
**FWIW, the person in America non-legally whom I know best is British, has a drivers license and does have an extra $300, but isn't UU.