Were you trying to be funny (if so, a smiley would help a lot), or do you not get that evolution works on a different time scale? Cultural evolution has dramatically outpaced biological evolution in humans in the last millenium, making the latter irrelevant.
In the realm of intelligence, cultural progress (which encompasses better education, nutrition, technology, and everything else) has led to the Flynn effect, a gain of 3-5 IQ points per decade. Biological evolution in Homo sapiens has given us at most 100 IQ points (but probably closer to 50) in the last 74,000 years. The former is three orders of magnitude faster!
Nutrition, Education, etc, have continual costs. If we have a continuously dropping natural intelligence, then the part of our intelligence derived from the environment will only get more expensive. That's unsustainable.
The Flynn effect itself will probably stop or slow all-but-completely anyway
From my understanding, recent IQ gains are more akin to recent increases of the life expectancy.
Evolution slowly created a biological basis for the maximum life span/intelligence (including genetics-based variability with relatively few individuals able to achieve extremes).
Cultural progress just allowed more people to: a) live longer up to their genetic maximum, b) be smarter up to their genetic maximum. Thus it shifted the averages but not the extremes.
Flynn effect seems to support this: gains in IQ predominantly occur at the low end of the distribution.
See also discussion on iodine deficiency, it's the same principle:
In the realm of intelligence, cultural progress (which encompasses better education, nutrition, technology, and everything else) has led to the Flynn effect, a gain of 3-5 IQ points per decade. Biological evolution in Homo sapiens has given us at most 100 IQ points (but probably closer to 50) in the last 74,000 years. The former is three orders of magnitude faster!