Anthropology

As long as the route was open, small groups of humans would continue to migrate wherever they found new resources to survive. It's easier to believe family or clan groups migrating, each choosing its own pathway, than a focused mass migration.

I'm always suspicious of maps showing big arrows pointing in one certain direction. They should be as complex as a turbulent stream, with eddies and backwaters swirling backwards and forwards, splitting and rejoining, speeding up and slowing down chaotically.

Consider modern America -- what was "The Way West" ? It was multiple trails, traveled at different times by different groups, spread out over decades. Why think early humans, with fewer technological aids, less knowledge of their destinations, and forced to feed and supply themselves on the march, would travel in larger groups on an organized schedule ?

This is evidence that at least one group passed that way. In no way does it rule out the possibility of other groups, maybe even most others, taking different routes at different times.