> Would any evidence that contradicts the 'Out-of-Africa' dogma even get considered by Western scientists?

An easy example is that neanderthals, denisovans, h erectus, etc contribute via admixture to Homo Sapien Sapiens and well predate "out of africa" dates by hundreds of thousands of years. It's not a hard stretch to presume that other yet-unnamed branches of modern humans left earlier and admixed the same as the other named groups.

I don't think anyone is proposing an extant group of humans that don't have relatively recent roots in africa, though.