Entrepreneurship is at about 14% working age adults in the US (1). I would say that the number of people who would be entrepreneurs is higher, but limited by risk. Entrepreneurship is very high risk. Reducing that risk would enable more people to become entrepreneurs (a good thing). Removing the risk that being an entrepreneur will make you loose the shirt off your back, will allow more people to start companies.
It is not limited to entrepreneurship. How many more amazing painters would there be? Writers? How much more creative common good would there be in the world if basic needs (via UBI) was taken care of?
None of the current social risk insurance, are directly reducing this loss to us all.
(1) http://www.inc.com/leigh-buchanan/us-entrepreneurship-reache...