We did the Cinderella Breakfast on Christmas Eve. They had a lot of last minute cancellations due to the bad weather in the mid west portion of the country. Obviously people were snowed in at home, and didn't make it to Disney when they were supposed to. We had a PS, but there were a lot of people who were able to walk up and eat.
FYI... we had a PS for 6 people. They tried to sit us at 2 SEPERATE Tables! The tables were not close to each other! This did not sit well with us and we complained until they gave us a normal table where we all could sit together!
I don't like to complain to CM's, they're doing a job and dealing with a lot of people, but splitting up a family at the breakfast isn't cool.
Just an FYI of what could happen!
Good Luck!