Here is a cool infographic from http://fundersandfounders.com/serial-entrepreneurs-how-to-pursue-multiple-opportunities/ created by Anna Vital. She looked at the world’s billionaires. Most are self-made and most of those created many ventures to build their net worth whereas only about 14% focused on one venture their whole lives.
There must be a balance of pursuing one idea to a stage of some sort of completion and creating a new venture. Regardless, the infographic is very cool. Check out her website for other cool infographics.