*sigh* Diagon Alley and Gringotts would not make any logistical sense being located on the lower lot or replacing any of the lower lot attractions, INCLUDING Mummy.
As for none park expansion (backlot) not being included on the Expansion Plan, that doesn't mean it won't ever happen. The Expansion Plan is just a guideline, more for the City than anything, to show a general outlined proposal. If need be, I'm sure Universal would be able to build into the studio backlot, especially the falls lake area.
However, I don't see that as being practical for Potter, nor is it necessary. As for spreading of the crowds, it only helps in Florida to have two lands because they have TWO parks. More Potter would just make our park more congested in my opinion
I'd rather see finances go elsewhere on our franchises for new attractions.
Kinda tired of hearing about a Hollywood Potter Phase 2....personally speaking, of course....just seems silly considering that's so Blue Sky that it's not even funny...but hey, carry on. *shrug*
And after Potter, I don't believe the next big attraction would be in the lower lot, simply because there is no room, and I don't see them replacing any of the lower lot rides. I could only see them replacing a soundstage for a ride down there far into the future (not the Phantom soundstage though)
There's plenty of space they could redevelop into a neNew attraction after Potter on the Upper Lot. Replace Shrek with something, SES with something, HoH & Globe combo for something new, etc.