More than anything, they need to fix the traffic issues. When Star Wars opens this park will be an even bigger cluster F than it is because the streets are too narrow for the volume of guests they get now, let alone another 10-20,000 extra every day. They should have long ago made those backstage spokes off of the Crossroads of the World (Prospect Ave) open to guests full time.
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There is no reason or excuse why the guests leaving Fantasmic are routed through a backstage area every night. Opening that walkway would alleviate a lot of traffic and help with the dead end issue on Sunset Boulevard. It would also funnel some of the traffic out to the sides on the busier days rather than routing all guests up the central street.