You're missing my point. You're adding 14,000 seats for what is essentially overflow seating watching projections on a screen with an alternative view for a 17 minute fireworks show. If all of those seats end up being filled...the only route you have is to be filed back towards the park itself. My suggestion was perhaps moving the location of the theater(s) to somewhere that provides alternative routes to leave the park while also providing an authentic view of the projections, rather than a large movie screen?
Do you have suggested location?
Don't forget that 14,000 are divided in two. And by the time they reach the hub, the hub will have mostly exited. And if the two overflow paths on either side of Main St. are open, then each group has their own corridor.