>>8
Not at all. Species of lizards imported to isolated islands have been observed to evolve longer legs more fitting to the environment in under 50 years.
The black plague is thought by some to be responsible for the high prevalence in Europeans of a gene that grants resistance to among other things the HIV virus. The genetic diversity required for evolution is present, so as long as we have factors killing us of or limiting reproduction we should se the population as a whole adapt to counter these.
For example, in todays society, many people choose career over a family, take a long education, get a busy job, and die childless and lonely. People should thus tend to get more lazy and hornier, so they can escape the evolutionary dead end of education by getting knocked up in college.