Comparing 2016 AM Worlds to other events is Apples & Oranges. Madison has their slate of courses. Everyone else has a different one.
Madison has been working on prep'ing their courses, staff, volunteers, etc. for well over a year. Asking them to add more courses at the 11th hour is fine, but it reveals how little you know about producing such an event. And expecting them to add more courses at the 11th hour is just silly.
The PDGA probably had a good idea how many invites would go out for 2016 and they approved the Madison bid knowing there was a 576 cap. No one involved in organizing this event, nor most of the players who've participated in the last several years are surprised at this event filling and waitlisting. I do feel sorry for those players who expected this to be their first Worlds and thought registering the next morning would be good enough.
Charlotte Built 10 full courses in 3 years. So 1 or 2 temp courses at a golf course is not impossible...