If Dr. King was alive today, I think he would question the wisdom of having a so-called holiday named after him.
It is only a "holiday" in the sense that government offices, schools, banks and the Post Offices are all closed. For the majority of working Americans, it is not really a holiday at all. And for working parents with school age children, it can actually be a burden to have to arrange for child care on what would otherwise be a school day.
Dr King was a great man and he should be honored and remembered, but shutting down the schools and not delivering the mail is a poor way to accomplish that. Perhaps a better way to honor him would be to keep the schools open and have them spend the entire day educating the children on the history of the civil rights movement instead of just closing the school doors and letting the kids stay home and watch TV.