It is important to note the sample set of the survey: "The researchers surveyed 655 students entering Berea College, a private liberal arts college located in Kentucky, in the falls of 2000 and 2001."

I have a feeling that the results of the survey would be different at a public university with strong science and engineering programs.

My personal experience has been that many people will change their intended degrees, but rarely have I seen someone completely withdraw from science or engineering programs