One thing that I notice in my traditional classroom setting is that most students, even adult learners have what it takes to acquire a certain set of skills, provided that they are well explained by the instructor. What some lack, in regards to adult learners, is computer literacy. Therefore, I am willing to say, that any course can be taught online. The problem will lie in the students' ability to navigate through the computer learning fields. Some students will probably prefer to have a physical person present to help them when they come to a crossroad. Others, who are computer literate and/or high achievers, are willing to figure it out. That's where good tutorials can come in hand.