The revision of specific demographic parameters — the precise timing of divergences, the effective population sizes, the specific routes of migration — will continue as more data becomes available.

The field will not produce final answers.

Population genetics never does.

It produces progressively more refined models, better constrained by more data, approaching the truth of what happened but never reaching certainty.

That is how science works.

It is how history works too — not through the discovery of a definitive account, but through the accumulation of evidence that makes some accounts more probable and others less.

USR1 made one account much more probable and several others much less.