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AdeleneDawner comments on Shortness is now a treatable condition - Less Wrong
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I'm reasonably sure that high IQ (i.e. over 140) is not particularly well correlated with outstanding achievement. I am almost certain that extremely high IQ's are not a prerequisite for extraordinary achievement, though there may be some specific fields where this does not hold true (say, theoretical physics).
If someone with an IQ of 180 has a thousand times the chance of making some incredible breakthrough compared to someone with an IQ of 140, shifting from 1% of the people having IQ > 140 to having 25%+ of the people having an IQ over 140 would still probably generate a great deal of breakthroughs.
I remember reading that the optimal IQ for success in life is actually about 130, but can't find a source for that now. I did find this though, which seems to support your claim.
I think that having the general population's IQ raised would have such wide-ranging effects that looking at society as it is now isn't a very good indicator of what that would be like. Society as it is now isn't set up to support people with very high IQs (or even get the most out of the IQs that people have to begin with), so I'm pretty sure there would be changes to all kinds of things to fix that.
The linked article is problematic. There is a pretty agreed on correlation between IQ and income (the image obscures this). In the case of wealth the article claims that there is a non-linear relationship that makes really smart people have a low wealth level. But this is due to the author fitting a third degree polynomial to the data! I am pretty convinced it is a case of overfitting. See <a href="http://www.aleph.se/andart/archives/2007/04/cubic_terms_make_smart_people_bankrupt.html">my critique post for more details</a>.