While not gender specific: I think this[1] is the worst case possible consequence of focusing on getting 5 - 7 year olds of any gender involved in programing: it turns into the awful system that is math education many countries.

    A musician wakes from a terrible nightmare. In his dream he finds    
    himself in a society where music education has been made mandatory. 
   "We are helping our students become more competitive in an increasingly 
    sound-filled world." Educators, school systems, and the state are put 
    in charge of this vital project. Studies are commissioned, committees 
    are formed, and decisions are made — all without the advice or 
    participation of a single working musician or composer.
    ...

[1]http://www.maa.org/sites/default/files/pdf/devlin/LockhartsL...