Coachella is the only major multi-day festival I know of that doesn't provide wristbands and allow in-out priviledges.
Moving to 3 days is that going to change? The majority of festival goers are of the 3 day variety, avoid printing out 3 different tickets per person to get misplaced over the long weekend and checked in each day.
Security is important and must be done when each person enters but that aside this mundane ritual should be ended.
Even it we don't go to full in/out rights, at least save some trees and avoid the anguish of the handful of people in thousands that are going to lose one of those tickets over the longer weekend and speed up the entrance process.
I know this must be fueled by vendors that don't want people ducking out to their cars for victuals and drinks, but com'on there's enough revenue generated especially with the extra day and the relatively low extra overhead.