I'm currently a freshman in college, but i've had plenty of programming experience. I've done projects that i thought would be practical to do because it'd teach me some useful things (like js frameworks and wordpress and web scraping) but recently i've lost the really passionate interest in things like that.

What I really want to do is get into networking and embedded devices and big data and computer vision, however I feel like getting into that stuff would be time wasting because I won't necessarily be using those things I learn later on, so I should just keep learning things that make me more marketable (like getting better at webdev and picking up android/ios development), right?

Should I go for getting into stuff that I really want to get into, or should I keep improving my 'marketability'?