Future proofing CS knowledge

I'm a computer science student. Programming and IT change very fast, and constant learning is required to keep up.

However, I'm wondering about how a programmer would try to "future-proof" his CS knowledge. Is it more important to learn the math, algorithms, and logic instead of focusing primarily on languages?

What are the trends you guys see in computer science right now? What knowledge will still be valuable in the future, 30-50 years from now?