Let me add, the new Pedestrian Bridge is planned without stairs, but using ramps. The bridge is supposed to be about 20 feet high, so there will be room needed on both sides of Harbor, the east side ramp will be where the Carousel is, and the west bound ramp will be over the Cast Member parking area/drop off (Harbor Pointe next to Costuming). The ramp doesn't have to be 20 feet high for much of it, just tall enough for the CM Buses and then tall enough to walk under closer to Costuming. The entire bridge and ramps will be in a secure area, so once you go through security on the East Side, you won't have to do it again. But no elevators on escalators are planned currently, just a low grade ramp that meets ADA requirements (that means no more than a one foot raise over 12 feet of the ramp, so the ramps will have to be at least 240 feet long, think of the Tomorrowland Monorail ramps, which meet the code regarding slope)
It looks like the Toy Story Lot buses will drop off a bit farther away, where the Taxi Stand is currently off of Harbor. This and a special ADA shuttle service from the new Transportation Hub will be the only two shuttles allowed to use the area (driveway entrance at Disney Way). Then there will be a secondary Security Check entrance for those guests, and those crossing on Harbor Blvd at Manchester (the HoJo folks). It will much smaller in size than currently available.
Yes, there are rumors from multiple sources that the current Toy Story Shuttle Drop Off area will become part of DCA to allow expansion for Marvel Land, and it does make sense. They could easily decide to remove Stage 17, Monsters Inc. and other nearby structures for a new area to develop. And with more land space available, a good potential for a major attraction.
No changes are planned to the West Side, Downtown Disney and the Hotels will be outside the Security Zone, and all folks parking at the Mickey & friends Structure will be screened after taking the tram.
As for the Toy Story Lot, it will remain open most days, and might even be expanded. A lot of it has to do with how the new Star Wars Land impactes attendance. So on slow days, the Toy Story Lot won't open when the park opens, and will only open when needed. But on most days, it will still operate. The city wants more access to it though, for the Convention Center and its expansion (they lost parking next to the Hilton), so there will be a deal made as part of the permit approval. Expansion of Toy Story will depend on the new planned Cast Member parking Structure planned for the corner of Harbor and Ball, currently a flat level CM lot. But Disney wil pay for the new structure if demand warrants.
As for the city closing the current crosswalk, there is no "need" for it after the Bridge opens, and they can easily close it, if that is what they want to do. (We are talking city owned land, not Disney). They are providing crossing at Manchester with a Traffic Light. And yes, there will more than likely be Anaheim Police in the area when the change is first made to keep people from playing Frogger. And it IS against the law to cross in the middle of a street, it is called Jaywalking and enforced in California and many other places. (Since the city wants to remove the light and intersection next to the Park Vue Inn).
And the new ADA shuttle I mentioned will load at the new Eastern Transporation Harbor off Manchester, where folks taking the ART Shuttle, other Hotel Shuttles and public Transporation (OCTA/LA Metro) will be droping off guests. It will go up Manchester to Harbor, turn left on Harbor to Disney Way, go into the new Shuttle area and drop off, then take Disney Way to Clementine/Manchester back to the new Hub. (Circle route). That and the Toy Story Buses will be the only two allowed to use the area. Anyone being dropped off with ADA needs will have to go to the new Hub on Manchester, and use the new Shuttle, or opt for using the bridge, which some folks will opt to do
So there are winners, with the Quality Inn, Holiday Inn Express and Grand Legacy at the Park getting lucky with the new changes, and the Park Vue Inn and BWPPPI&S being the losers and requiring more of a walk.
But as stated, these are still PROPOSED changes and we will know more in the next couple of months, as there is the review period, and then the Planning Commission hearing at City Hall, and then there are cases where the entire City Council will want to have a second review and vote. But Disney really wants the project done by the time Star Wars Land opens to the public.