In the future, we will not pay for college since everything you can learn in college is available online. You will only have to pay if you require specialized instruction, such as that for a surgeon's program. Otherwise, everything from economics to literature to even music can be learned online now.
It is not practical to take classes on the Internet. Students and teachers cannot interact as in a traditional classroom. Although the Internet will always be an important supplemental information source, it will never replace the kind of education that has always existed. You can't learn well without personal interaction.