Starting something with the goal of disrupting an existing industry is like becoming an actor or singer with the goal of making it to the Top 10 charts: both types of efforts are doomed to fail because they focus on the wrong thing.

The right thing to focus on would be to try to do the best job possible. A musician who tries to create the best music possible and to connect with his/her fans at the deepest level possible is much more likely to actually become famous. In other words, things like "disruption" and "becoming famous" are best treated as byproducts, rather than the main goal.