Anecdotally, very few people buy Chromebooks as their primary college computer. Most people, irrespective of their major, need to work with Microsoft Office, sometimes some custom publisher software, etc. and nobody seems to thing that Chrome OS is up for this task. Plus, I feel like a "college computer" is a weighty purchase for many students, and buying a $200 Chromebook doesn't really seem right for this.
For computer science, the only people who buy Chromebooks are the people who install Linux on them or have another machine to SSH into.