I just don't think that DHS can physically handle the numbers they are expecting. The entrance and walkways are physically too small for the crowds they get now, let alone adding 30% more guests. I'm really surprised they haven't been doing more to ease the entry/exit traffic flow in preparation.
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That backstage road (which gets used for the Fantasmic eixt) should become an onstage road both directions to help with the congestion now. There should be no sending guests through backstage areas unless it's truly an emergency, and if they are going to use it all the time they should do what they did with the Main Street bypass and make it "guest ready" all the time.