The world will never be open source. But, lots of awesome tools, libraries, programming languages, and servers, are. Get a job working on web applications, because you'll get to use lots of free and open technology that way, and likely contribute back to projects.
Open source is not the answer to every problem. Proprietary software beats it in several ways and will never disappear. Anyone telling you something else is ignoring the overwhelming mound of data called reality. OTOH, I love open tools and prefer them over proprietary ones by far. But, there's not a damn chance in the world that the next big thing everyone uses is going to be developed bazaar style.
Open source might produce some better software, but companies are the most efficient beast for producing anything. Companies will only open source things when it benefits them (logically), and since open sourcing code will not benefit companies 100% of the time, the primary producers of software (companies) will prevent this open source utopia from ever existing.