I have mixed feelings on this. Having been three times, I actually love Diagon Alley, and even enjoy Gringotts. And in this very "Instagram" age, Diagon Alley is basically one giant Instagram opportunity. Selfishly, I'd personally love to see it come here.
But I do see how it takes up a very large space--space that Hollywood doesn't really have as much. So I can see the side of the argument of putting something else instead. And I also understand not wanting to "clone" too much.
But that said, the vast majority of GP don't get to both coasts that often, which is a fair argument to clone. And our Hogsmeade/FJ is not a direct clone... in fact, I'd say it's even improved a bit. So I'd be even more curious to see how they'd "upgrade" Diagon Alley.
Like I said.... mixed feelings.
Some minor points about our Hogsmeade/FJ... gotta give props to the Sons of Durmstrang at the Tri-Wizard show, they've really stepped up their game with their performances lately. As for FJ, it's still in pretty great shape overall, but I still don't really understand why they've never fixed the focus of the opening flue scene, or why they haven't repaired the blue light that shines on the rocks as a better transition to the final screen scene. It's been off for months, and seems it should be a relatively easy fix. :/