My worry with the Paramount park is the choice of franchises.
Sleepy Hollow? Even excluding the Johnny Depp version, it's a famous ghost story so that's fine indefinitely.
Star Trek? Always relevant as it always has some form franchise running.
Grease? Timeless but very narrow ride/show opportunities.
Rango? It flopped and although it deserved better, it'll fade into obscurity by the time it's built, let alone 10 years after that. It's also that bit too creepy for a children's zone.
Spiderwick Chronicles? Already long forgotten.
That said, you can have rides based on forgotten films that remain timeless. Very few Americans have ever actually seen Song of the South (lucky for them as it's long and boring and easily the worst of Disney's hybrid films) is popular.
In terms of money. Can't see Dubai not wanting to invest heavily. With the incredible transport links and "short train ride from central London" marketability, it's a potentially massive investment (despite it being roughly where a failed waterpark was).
This was roughly the region Universal wanted to build on wasn't it? They got blocked because they wanted to build on marshland.