We went last September!!! I was totally in the same boat as you. I wanted so badly to go because Donald is my favourite Disney character. I couldn't even tell you how many times I called before we left to see if there were any cancellations and any possibility that we could get a reservation - sadly we couldn't and I was really bummed out.
The morning that we planned to go to AK, I got up at 7 a.m. when the reservation desk was opened and called Disney Dining to see if there had been any cancellations. I was thrilled when they told me that they had a spot available for 8 a.m. I felt like I was the luckiest girl in the "world". My boyfriend and I got ready as fast as we could and dashed out of our hotel room to make the reservation for 8a.m. When we got there, they couldn't find our reservation! It turned out that the agent I spoke to booked me for the following day (Thursday) instead of that day (Wednesday). I was completely bummed out, but to my surprise, they accommodated us anyways and honoured our reservation.
It was the best breakfast we had during out stay there. It was buffet style and they had anything and everything!
So keep trying to make reservations but if you're unable to, call when you arrive at Disney World. I'll be keeping my fingers cross for you. Good luck!