Has anyone else heard of this? An asteroid/s hitting the Laurentide ice sheet and starting fires that killed the American megafauna and Clovis culture in one hit.
Like Tunguska such an event is teeming with AH possibilities.
The 'clovis points' were most useful for hunting big game. Once most of the megafuna had gone, whether due to over-hunting or to anything else, their replacement by alternative designs was probably very likely anyway.