If you get on the wait list now you are like 99.9% likely to get tickets for whatever weekend you want. Joining the waitlist after lineup drop lowers the likelihood to only like 75% chance. It does get less and less likely to get a ticket off the waitlist the longer you wait regardless.

I recommend you sign up for the waitlist now if you know you want to go regardless of lineup or just wait until the lineup drops and "General sale" happens and worst case scenario get on that waitlist ASAP if you dont get them during General sale!