Did you ever try to book breakfast at the Castle (before the price change and before the 180 day thing)? It's not quite as bad as that was, but the principal is the same.
Some people got lucky (because they knew how it worked and were willing to keep trying), but most people were unsuccessful. There just weren't as many spaces as people who wanted them.
If you want VWL in December and have to book at the 7 month window, you'll need to call day by day, be willing to use the waitlist and also be lucky. Even then, you may or may not be successful - just like those who wanted to eat with the Princesses.
Good luck!