We can already get a hint from real life, in Asian countries that have an artificially high male/female live birth ratio, in part due to China's One Child policy. This is the opposite of your "solution," in that men are favored for survival, but it has serious social consequences, including unreported pregnancies and increased mother and child mortality at birth due to birthing secretly at home, potentially severe social and mental health problems due to large numbers of men unable to marry, increased kidnapping of women for marriage and prostitution, increased HIV infections, the "4:2:1" problem and other interesting phenomena.
When you poke at something as large and complex as "people," you sometimes get what you want, but you also sometimes get what you didn't expect.
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We can already get a hint from real life, in Asian countries that have an artificially high male/female live birth ratio, in part due to China's One Child policy. This is the opposite of your "solution," in that men are favored for survival, but it has serious social consequences, including unreported pregnancies and increased mother and child mortality at birth due to birthing secretly at home, potentially severe social and mental health problems due to large numbers of men unable to marry, increased kidnapping of women for marriage and prostitution, increased HIV infections, the "4:2:1" problem and other interesting phenomena.
When you poke at something as large and complex as "people," you sometimes get what you want, but you also sometimes get what you didn't expect.
This article is worth the read: http://www.nejm.org/doi/full/10.1056/NEJMhpr051833#t=article
The 4-2-1 problem: http://en.wikipedia.org/wiki/One-child_policy#The_.22four-tw...