Are you talking about raising the IQ of a person, or the average IQ of a population? There's little discussion of the former because decades of failed interventions has made "you can't raise an existing person's IQ reliably" the default hypothesis. Once you've got past the easy childhood stuff like nutrition, lead paint and iodine deficiencies, there's not a lot you can do. Aside from some kind of Black Swan like a pill that raises you up a standard deviation, there's not much room for hope.
Raising the IQ of the next generations though, there's discussion on that since all the theory deems it totally possible. See here for example.
But yes, in absolute terms there's little discussion on how to solve the problem. Many writers assume the problem is politically intractable.
I was talking about raising the IQs of large numbers of existing people.
My impression is that there just isn't much interest is looking for physical solutions.
Compare the amount of interest in combating obesity to the amount of interest in becoming more intelligent.
A long blog post explains why the author, a feminist, is not comfortable with the rationalist community despite thinking it is "super cool and interesting". It's directed specifically at Yvain, but it's probably general enough to be of some interest here.
http://apophemi.wordpress.com/2014/01/04/why-im-not-on-the-rationalist-masterlist/
I'm not sure if I can summarize this fairly but the main thrust seems to be that we are overly willing to entertain offensive/taboo/hurtful ideas and this drives off many types of people. Here's a quote:
The author perceives a link between LW type open discourse and danger to minority groups. I'm not sure whether that's true or not. Take race. Many LWers are willing to entertain ideas about the existence and possible importance of average group differences in psychological traits. So, maybe LWers are racists. But they're racists who continually obsess over optimizing their philanthropic contributions to African charities. So, maybe not racists in a dangerous way?
An overly rosy view, perhaps, and I don't want to deny the reality of the blogger's experience. Clearly, the person is intelligent and attracted to some aspects of LW discourse while turned off by other aspects.