1) Reservations are readily available.
2) Alas, of the resort eateries, this is one of the hardest to get, and even harder to find openings later.
3) But, it does happen
. . . when the stars are perfectly aligned
. . . when pigs seen flying
. . . when Karma turns your way
NOTE: The easiest way is to find a resort Concierge with an OVERRIDE CODE (usually 1-2 per resort). Such concierge can get you into any sold-out eatery (except capacity limited venues such as HDDR, Luau, BBQ). I have accommodated any person, any group (regardless of size), at any date, at any time. This is one reason why some venues are almost always behind the ADR time - sine so many people were added beyond the dining system schedule times. As an example, I once added a group of 14 people into a sold out CRT - and ended backing ADR's up more than 45-minutes.