Sopa will die. It will die a thousand deaths. If it doesn't and BurningMan is targeted for DNS kick/ban, it will be subjected to the Streisand Effect
and gain in popularity. People will do whatever it takes to get to the website (which isn't much given how easy SOPA/PIPA is to circumvent.) Either that, or tickets will start getting less scarce
...All sabre-rattling aside, i don't think the BurningMan forums are that much of a hotbed of unlicensed media. Avatars can be easily removed or blocked, and links removed by moderators. Most php-based forums can also be made fully private, which reduces the likelihood of snooping from outside sources.
After painstakingly researching the new ticket sale system, I have deduced that there is an inverse relationship between fretting about the ticket system, and the length of time one is able to stay aroused during coitus. Please spread the word!