They'll definitely need to go back to IOA at some form during what looks to be a massive Jaws construction. They could move the sprung tents behind Cat in the Hat if it's a two park event or the field between Dundley and JP if it's IOA only.
I think they need to fit some sort of house in the nazaram's/sting alley since the Delancy/South st area was dead like creepy New York alley this year. The event is usually bottle necked over by Bill and Ted and MIB and would only be worst if Amity was closed off.
Even though I'm sure they can't put any HHN stuff in WWOHP, it should be open at least for capacity. Speaking of which, using two parks would open up Despicable Me, Mummy and Hollywood RRR.