A small subset of the population even has the potential to program and that's probably not going to change. If a lot more people are encouraged to try it out then a small amount more of the people who had an aptitude for it but didn't realize it will enter the workforce. The leftover majority will still not be able to. No dramatic increase in programmers is going to happen.

http://www.eis.mdx.ac.uk/research/PhDArea/saeed/

http://blog.codinghorror.com/separating-programming-sheep-fr...