Children act the way their parents allow them to act. I have a 9 year old son and he behaves better than most teenagers and adults, but we have always expected him to behave according to the situation he is placed in. So to say that my son would not be welcome to dine anywhere solely based on his age and not his maturity level is offensive to me personally. I realize that some children don't know how to behave, but I blame that on their parents. Then again some adults don't know how to behave either.
Some have said...."wouldn't you like to dine without your child(ren) occasionally"....well, no, at least not at WDW. For us it is a family vacation and our son is part of the family. As for not having to worry about dropping four letter words as one poster suggested......as a rule we don't use that language so that is not an issue in our case. And before anyone suggests otherwise, I am fully aware that our son is not perfect. He makes mistakes and when he does we are there to correct him and show him the right way. Little people grow into adults and if the parent doesn't expose them to different situations and experiences and model for them appropriate behavior then how are they supposed to know how to act when they do become an adult?