If we accept the definition "fundamental dispositions and traits of humans" then I wouldn't consider those examples to qualify, as they are not sufficiently fundamental in my view. They are closer to social norms. If we experienced a wholesale global economic collapse, I could easily see our great-grandchildren retuning to those and other barbaric norms.
Just to join in: since it's "human nature", I think it's reasonable to consider only things which are relatively universal / innate, not learned things like social norms.
2,000 years is very little time on a genetic timescale, I wouldn't expect to see many changes. Some, sure, but not much.
