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Computer Science doesn't change quickly at all. Slightly faster than maths does, perhaps. Only the fashionable language changes quickly.

I think that many people these days don't understand the difference between CS and "making websites with RoR".

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I agree with that. But, a typical course contains bits that don't change e.g algorithm theory and bits that do , e.g programming skills learned from implementing algorithms, which, back in the day would have been in Pascal or C, nowadays is in Java or Python, and in future maybe some other language. So taking such a course would have 2 aims - get a good grounding in theory, and get some buzzwords on your resume / c.v too . People who don't understand the difference between CS and making RoR websites , sadly include many hiring managers, right? ;)

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