[CuriouslyC]

The only things that are really future proof are the core fundamentals. That means writing and math. If you want to get more specific than that, I would say essays, presentations and technical writing, linear algebra, probability theory & bayesian inference, information theory, graph theory & discrete mathematics. Being very strong in those areas will let you become productive on anything else on your list quickly.

If you aren't interested in a career in machine learning/data analysis in the near future you can hold off on anything deeper than the things I mentioned above. The field will look totally different within about 10-15 years (e.g. nobody cares about random forests, boosting or support vector machines anymore).

While Javascript is hot right now, the field is in such flux, and application development in general is in such flux, that it isn't worth the time to learn unless you're getting paid to do so.