Ok, my turn to add to bubbagates comments. Guess we're gonna tag team this subject.

I disagree. It's like any other skill that is taught to a new student. They will learn it if you teach it to them. If you don't teach them the skill, then they will learn bad habits that they may never "un-learn". How many pilots have you seen go through their whole life doing things "wrong" or badly because that is what they learned when training, and never took the time to learn the correct way. If you teach a student correctly the first time you don't have to worry if they can pick the skills up later, they have them the first time.

Landing in a crosswind is a skill that I think every student should have. In fact, I won't solo a student until they have landed in a crosswind and shown that they can control the plane in the crosswind.