A CS class might easily take 3x the time of a typical Econ class, if not more. The difference in difficulty is absurd - it wasn't unusual that all I had to do

A CS class might easily take 3x the time of a typical Econ class, if not more. The difference in difficulty is absurd - it wasn't unusual that all I had to do for an Econ class was show up for the midterm and final with cramming the day before. This is a really big change in direction, so the question is really up to you, unfortunately. You need to find out if you really are passionate about CS, or if you really just like the idea of being a tech entrepreneur. You need to just get in there and take classes, and above all, build something. Then you will know. If you find out it's not for you, no biggie, you just took one or two classes extra. After all, you don't have to graduate with a minor.