I am surprised there is not more emphasis on the much longer walk to the shuttles from the parks. An equivalent of walking north to the overpass, or south, to almost Katella. You may as well just continue to walk the rest of the way, to most hotels, at that point.
I also don't see why they couldn't just keep the crosswalk and entrance open; squeeze in the entire Transportation Hub, Disney Shuttle Drop-off, and Disney Cast Drop-off together on the west side of Harbor, all the way from Disney Way to the new Pedestrian Bridge; and put half the Security just south of the bridge incline. I am pretty sure there is actually enough space. And it would solve most of the current issues and complaints with the project. And they would continue to have the entire current Disney Shuttle Drop-off area for future expansion. It would be a win-win for everybody.
OK, the extra walk is about 3/10th of a mile each way, then you still have to walk south to Katella, so a bit more of a walk, and many folks will still use the ART Shuttles, Public Transit (OCTA and LA Metro), Private shuttles and Tour Vans, add to that Taxis, and now Uber/Lyft, and you need more space for all these vehicles, plus the 7,000 parking space the new Pumbaa Structure will offer, and maybe more in a few years when the USCIS lease runs out.
Disney has plans for the former space, mainly expansion for DCA, but you still need room for the bridge ramp, and the new secure zone for the Toy Story Buses (who will have their security check at the bus loading area, just like Mickey & Friends, when the new Manchester Security Check opens.
Add the additional attendance to both Star Wars Land and DCA expansion, and you need a larger facility to deal with the larger crowd. We are looking at replacing 16 security stations on the East Side currently, and will be over 50 by the time the project is completed (about 40 at the Transportation Hub, and 16 or so at Toy Story Lot), and that IS a BIG Win for everyone, less time in line for the guests, and less complaints to Disney, and a better and more Secure park.