With three news hotels and over 3,000 new onsite rooms being added by the time the 30th anniversary rolls around, I can't help but wonder if the budget this year went up in order to get more guests into the event to get them hooked. I have a feeling we will be seeing a LOT of first time visitors this year with just Stranger Things alone. Get them in this year, have them fall in love with the event so next year they go for a few nights and stay onsite at the new value resort. Then by the time the 30th rolls around and the 2nd half of the new resort (with over 2,000 new rooms alone) opens up, maybe, just maybe the event will have gotten big enough to branch into both parks for the BIG anniversary year. I think a big reason we don't have both parks now is the resort has gotten much more popular since the old IoA HHN days and they want to make sure guests that don't want to go to HHN have something to do in the evening over at IoA.
This brings me to my next point...the new park that we all know is happening. Way to much prep work is already going on (heck, 2000 new rooms are being built close by it). IoA took about a year and half from breaking ground until grand opening. Even if they don't break ground until early next year, it's VERY possible they will have the new park open by fall 2020. This would easily allow them to expand to into IoA for the 30th anniversary without fear of shutting people out from all the parks.