...you do realize Diagon, Kong and KidZone are basically going to cause a huge increase in attendance?
both parks will likely be at 8.5 million each this year, both should pass 9 million in 2015 with Kong and the 25th celebration and Diagon's first full year, with KidZone bringing them each to somewhere around 9.5 million by 2016.
It's not science when you consider that both parks have a shot at over 10 million each by the end of the decade. Potter isn't a fad - and it's Universal's first smash hit of the theme park world. IOA is pretty much locked for 10 million guests by 2017 if they do the JP revamp in addition to something for Seuss. But both should get past 10 million each by 2020 which would be enough for a 3rd gate. Guest spending is through the roof, so 15-20 million each wouldn't be necessary for a 3rd gate, but I do get how there needs to be a little demand.
You just seem like you're being totally pessimistic about how much Universal Orlando will increase in attendance, though. In 3 years, IOA added 2.2 million from just Potter. USF added over a million without anything on the scale of Potter. Diagon and HE are bound to cause some noticeable increases in attendance. All of the other additions/expansions in the work are only going to help the growth. Comcast wouldn't greenlight/plan all of these expansions if they hadnt calculated the potential market and how much demand there is. How many attendance would you expect at each park before a 3rd gate? Universal has to strike while the momentum is on there and before Disney bothers to add Star Wars Land
2021 isn't unreasonable since it sounds like the 3rd gate plans weren't started yesterday. 7 years is enough to grow attendance at both parks. Although I could see 2024 or so being more likely
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Yeah that whole front area of Toon Lagoon could fit a dark ride, show and maybe a flat if they bulldozed it and started from scratch. That whole section is a jumbled mess