Having a floor beneath which dates can’t sink isn’t new in American archaeology, or perhaps rather what passes for archaeology. It would be great if the obstacles to acceptance would die off, but I’m not sure it would help. Before Clovis-first-and-only caught on, human antiquity in the Americas was pegged around 1000 BC. Clovis was controversial and even pseudoscientific until the 1950s when RC dating destroyed objections to the dating. Having Clovis as the new floor required that a small group of hunters hustled across Beringia, waiting thousands of years for the ice to melt, then exploded across the landscape, super-hunting megafauna to extinction in order to feed what *had to* be the largest and most rapid population explosion ever documented (even though it has never been in evidence). From Alaska to Tierra del Fuego, the single group of immigrants covered two continents so rapidly that the dating can’t be discerned from one to another.
Oh, I agree but the ability to suggest 'settled science' ain't, is just so hard to resist. I am a firm believer in the axiom from the late great Arthur C Clarke which goes; "When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong."
My personal guesstimate is that the initial migrants probably came down the ice sheet in kayaks (skin boats) hunting and fishing and camping on shorelines long since flooded from the glacier melt. They had a clear shot down the west coast of the Americas and good hunting all of the way south. Waiting for the overland ice-free passage probably brought additional peoples that intermarried but there have been people here a very long time!