Why did someone think it was a good idea to switch to JavaScript?
I think the person who'll get value out of SICP will not have any problem picking up scheme syntax on the fly.
If you study any other related field like math or physics you become accustomed to learning a formal system for the context of a particular problem.
CS students tend to have this weird careerist view where every page just directly help them get a job.
Schools are so desperate to keep up enrollment numbers today that many have capitulated and are giving students what they want instead of what the faculty thinks they need.
Somewhat understandable considering that student loans put you into indentured servitude unless you have rich parents. Although I still think they're shortsighted. A good CS graduate should understand that programming languages are just syntactic sugar over the underlying concepts and have little trouble translating/picking up the basics of new languages.