Although I'm sure we can debate this. I honestly don't see humans evolving all that much over time. We adapt or environments to us instead of falling victim to it like other species. The only force I see still at work is sexual selection and even then most humans still will have a chance to reproduce...
I agree. Globalization, modern medicine and agriculture have greatly decreased the selective pressures remaining on the human race.
It is estimated that 1.3% of children in the US will die before the age of 20.
I believe this to be a good estimate of the number of offspring who will reach the age of reproduction. With the numbers this high I see it unlikely that there is enough selective pressure to cause enough evolution resulting in a speciation event.
Compare this to Chimpanzees of whom only 60% reach the age of 7; where the reproductive age is between 7 and 15.
http://www.unl.edu/rhames/chimprs/chimprs.htm
There would really need to be a mass pressure event or isolation in order to quell the mixing of human populations worldwide. Globalization has most likely also contributed to the mixing of human DNA across the globe. I see it unlikely that a human speciation even resulting in 2 distinct species would occur without a great increase in selective pressure.
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