Since Universal built 2nd expansion for Harry Potter as Diagon Alley expansion at Universal Studios Florida area in 2nd park of Universal Orlando Resort after they built 1st expansion as Hosmeade with Wizarding World of Harry Potter at Islands of Adventure in Universal Orlando Resort.

So more fans who live in California and near in Los Angeles, California USA,

that Universal and Warner Brothers and J.K. Rowling should expand more Harry Potter 2nd expansion to also build in Universal Studios Hollywood, Los Angeles, California USA as same they did built in Orlando for more Harry Potter fans awaits.

Possibly it should connect to build King's Cross station to create Hogwarts Express train ride attraction to start build at "Lower Lot" in Universal Studios Hollywood to make way rail for Hogwarts to connect to "Upper Lot" to attatch in Hosmeade near Hogwarts Castle area in Wizarding World of Harry Potter.

Also, they should build Harry Potter more phase attraction to be build "Harry Potter and the Escape from the Gringotts" ride in new Lower Lot attraction.

Now it is also make sense to retheme Transformers the ride 3d to redesign the vehicle into HARRY POTTER's flying magical car that based on Harry Potter and the Chamber of Secrets scene in the film for most excited thrilling 3D fantasy ride experience as well in Lower Lot.

Plus Universal Studios Hollywood should also build one more new ride in Upper Lot area to build "Harry Potter: Hagrid's Motorbike and the Magical Creatures" as well in California for more expansion.

Of course in Lower lot in Diagon Alley they should also build "Leakey Caluldron" for restaurant and more shopping retails and stuff to expand.