It is pretty much impossible to estimate the job market for entrepreneurs as they are the ones who basically create the working places for everyone else.
The success rate would certainly depend on the industry that you decide to choose and the location, as well as your idea and execution.
Nearly 14% of working-age Americans are starting or already running their own businesses.
Entrepreneurs are the driving force of the country’s economy, however, the number of businessmen and businesswomen does depend on the overall economy.