Genetic

At the rate at which the races are currently mixing it's reasonable to expect that within 10 or 20 generations there will be very little distinction between races any more. And the further we go the more homogenized the races will become.

In the future there may no longer be "blacks" or "whites" or "asians" or "Eskimo's", there may only be one large homogenized base of humanity. There will always be variation within the population and some few people will exhibit more race-dominant characteristics, but the bulk of humanity will all look mostly the same.

Will prejudice be gone at that point? I doubt it. Humanity will probably always find ways to classify people into various groups (rich or poor or tall or short). I don't think biases like that will evaporate until Extra-Terrestrials make contact and we have another group to focus our bias upon.

All excellent points, ros. Have you run across the theory that the so-called Caucasian (i.e. white European) race is the result of a mutation which must have occurred at some point in pre-history among the Cro-Magnon? Apparently all the early homo sapiens were quite dark-skinned and it's hard to explain where the pale-skinned ones suddenly came from except through some genetic mutation.

Andy, the Cro-Magnons weren't as dark as the Neanderthals though and they were much taller too. They did interbreed with each other where facial features became more refined (high cheekbones etc.) but I think the fair
skin color occurred through natural evolution, especially in the northern European regions where even summers had low temperatures.

To answer the original question: I highly doubt that we'll become ever one race through interbreeding. Yes, we will see exogamy, but not everywhere. Plus, every once in a while there will be a true white or true black genetic mutation that will define the genetic of the future generation. My opinion is that genetic diversity will remain active.

There is certainly a "browning" effect that is occuring and will continue. I don't think that Caucasoid, Negroid, and Mongoloid DNA will never completely combine into one race, though.