Welcome to the fray MikeMcC.
I think a very solid proof that we have evolved from a common ancestor will arive the day we realise that not all "humans" can interbreed. We will certainly, eventually, evolve enough that people, for argument's sake, on far sides of the planet to one another could not possibly reproduce, by natural methods anyway, and thus be considered different species.
You need to consider
gene flow rather than individual mating. With the increasing globalization, I think it is less likely for people to become genetically isolated than in the past.
Probably the biggest test of human breeding was the european discovery of america and the indigenous population here.
Isolation doesn't always lead to genetic incompatibility, even after many generations - without any selection pressure for the basic phenotype to change all that you have is random mutation and genetic drift.
Enjoy.
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