Several commenters have pointed out that you are misuing words like "maladaptive," when traits like aggression are often highly adaptive. And that's a problem. But I don't understand how you think what you're calling evolution would even work.
What exactly are you refering to when you talk about natural selection? To invoke Sagan, the secrets of evolution are time and death. Evolutionary reasons for the way we are are made up of ancestors who passed their genes on. Your edits emphasize that this would be a voluntary process, but if the people who choose not to modify the way you want them to are still around, I'm not sure you can call that natural selection.
Are people, en mass, going to decide that their values are wrong? I don't think anyone takes birth control with the intent to be attracted to less masculine men. The average person is not going to say "my current goals are incorrect, therefore I'm going to change my thinking so I desire the correct things." Heck, people aren't even doing simple self modifications that would make them more effective at the goals they currently have. Not all agreeable men are studying PUA even if they acknowledge it would help them be more attractive to the opposite sex. But some are, and I'd assume that a drug that made men even more aggressive and less empathetic would sell more than one that emphasized traits like empathy because it helps them achieve the goals they have.
(Outside of various transhumanist communities, I don't think people would actually consider chemical or neurological self-modification. I'd be happy to be shown wrong on this though.)
Upon reading Eliezer's possible gender dystopias ([catgirls](http://lesswrong.com/lw/xt/interpersonal_entanglement/), and [verthandi](http://lesswrong.com/lw/xu/failed_utopia_42/) and the other LW comments and posts on the subject of future gender relations, I came to a rather different conclusion than the ones I've seen espoused here. After searching around the internet a bit, I discovered that my ideas tend to fall under the general category of "postgenderism", and I am wondering what my fellow LessWrongians think of it.
This can generally be broken down to the following claims:
EDIT- Due to some really insightful comments;
I replaced men being prone to aggression as a negative, with men being prone to suicide.
I made the verbiage a little more explicit that no one would be *forced* to change, but would seek out the changes that transhumanism would have available.