Sure, but there are arguably 300 million people in America who "would like to be president" I imagine. It's every child's dream, isn't it? To grow up to be president one day?
There are millions of people who want to play professional basketball, too. And many more "professional basketball player" positions available as there are POTUS. But even still, after the ~3,000 professional basketball players that the NBA has seen pass through it's doors, only 78 of them have become "second generation" professional basketball players. [0]
The odds of both sons of a former POTUS becoming (or even having a strong chance of becoming, in Jeb's case) president are just out of this world when compared to other disciplines.
[0] https://en.wikipedia.org/wiki/List_of_second-generation_Nati...
edit: I changed 10,000 pro basketball players to ~3,000 as per forrestthewoods's info below.