One thing you all haven't mentioned is that people traveling with emotional support animals can also pre board! Now, there's a can of puppies we probably don't want to open.
Honestly, one thing WN could do is have a wheelchair concierge service of some sort that makes it uncomfortable to cheat on those "miracle flights". Ms. Jones, your arrival wheelchair was ordered when you took at that wheelchair at departure. It's here now. What? You don't need it? Ok, just let me write that down for our records.....