The same exact thing happened to me last year, however, last year the booking window for ADRs was 90 days. We have never seen Fantasmic, and when I finally found out you could get a package, I tried and tried but was never able to secure one. I was afraid to show up 90 minutes before the show because I have three small children, the youngest was 3 at the time, and I was afraid they would not be able to tolerate the wait.
So, lesson learned, this year I called at 7:00 a.m. sharp on my 180 and got the package. So, if not this year, there's always the next trip! And you never know, someone just might cancel! Good luck!!