It would upset our understanding of human evolution.
However, there are not problems there. The 'paulxy river' footprints are not human footprints at all. they are mostly a different kind of dinosaur (and not even going in the proper direction, and some are modern forgies. The "Creation Evidence Museusm" is run by a Carl Baugh, who has made many outragous and fraudulant claims, inclding
have a 'fossilzed' human finger, and all sorts of nonsense.
The personw who runs the museum , although he claims to have a PHD, is a Baptist minister who went to an non-accreditied university.