From what I have learned it comes down to respect. Allowing them to make the calls while avoids a fight/confrontation for that day ... over times it erodes the respect they once had for us. I know for certain I was guilty of this, I would agree to what she felt she wanted just to avoid an hour of debate.
Your W wants Christmas for the feelz ... its just selfishness at this point and again her getting her way IMHO. Whatever you do .. please decide for YOU.