unschooling does not mean letting kids grow up 'stupid' as you say. they have the ability to learn ANYTHING that they CHOOSE to learn. unschoolers might not be at grade level with their so-called peers...but whatever they are lacking in can easily be learned........when real life requires it. unschoolers have not had the DESIRE TO LEARN squashed out of them.
as far as fighting for a job in the workplace....they simply won't be. most unschoolers have no desire to join the typical workforce...they are more likely to start their own businesses. they are innovative and the confines of what most people call 'work' are not what they are looking for in life. they will not be so easily convinced that being a paid slave is the way to a happy life.