I would say though that the City might be willing to approve the Manchester property to be used for backstage facilities if the parking structure is not an option. But this is more my own wishes than something even being considered.
WHAT BACKSTAGE FACILITIES???
Hello? What do you think can be moved beyond what already has? There are a couple of things that could go more vertical. The three green buildings on the SE corner of DCA should have been a multi-story building on the back of Cars Land facing Katella. The two entertainment buildings behind ToonTown (not the parade building behind SWGE) could be multi-story, but not where they are currently located. This leaves the NW corner by Ball and DL Drive. The motor pool was just relocated. They could have relocated it off-site, but opted not to. The large merchandise warehouse would create a logistical complexity I cannot fathom. Parade buildings are a non-starter. Ride vehicle maintenance would also be logistically difficult--Not impossible, but I rate it as doubtful.
Frankly, the only candidate I can think of is the bakery in the NW corner of Ball lot North of M&F.
As for relocating any backstage facilities to the Manchester lot North of Simba or Toy Story, I don't see the value. I think Disney would relocate them on the East side of I-5 where there is existing industrial real estate. I don't believe the City will approve any different use of Toy Story Lot absent the construction of a parking structure to make up for any eliminated parking spots. Frankly I don't understand why the city hasn't taken it by eminent domain for Convention Center parking.
But any discussion of relocating any more backstage facilities requires explanation of the viability of the scenario. I long expected the Staff shops to be moved--I had speculated they might be moved next to the bakery in Ball Lot. Moving Circle D had been planned even before SWGE. Horticulture and Recycling were relocated on-property.
IMHO, they have achieved 80-95% of possible expansion area from relocation. Their primary expansion areas are Autopia/Subs/Motor Boats (and possibly FLT), SE corner of DCA (already allocated to Marvel), Possible NE corner of DCA if bus dropoff is moved, and ToonTown and footprint of Entertainment building (if it is shifted farther North). But anything on the North side of DL is impacted by Pyro lockdown. If you overlay the layout of SWGE with the Pyro fallout area, something like 80-90% of SWGE is outside the Stage 1 fallout zone. IOW, SWGE will not be closing down for Pyro like Toontown most of the time.
I've been talking to CMs I know about this stuff for years. If you think relocating more backstage facilities is a thing--identify what they are and how it will work. Otherwise it's a pipe dream. YMMV.