The parks close so early due to the huge amount of $$$ Universal makes from hiring them out in the evening. My hope for the new land/parks is that they are able to balance this out better so that nighttime shows become a larger part of their repertoire for their guests, but being honest, I'm not really hopeful. It's something their main competitor doesn't offer to the same level (full park access most evenings) and so is a huge part of their financials.