It would destroy the timescale. If you start with the whole earth's mass made of nothing but carbon-14, and let it sit for 1 million years, all of it would decay except for one atom, and that atom would have a greater than 99% chance of decaying. Two million years does not mean two earths. 1,005,730 years means two earths, and by 2 million years, you could decay all the matter in the universe from carbon-14 to nitrogen-14. That means that if there is supposedly "2 million year old", or "200 million year old", material that still has residual radiocarbon, it simply could not be that old.
2010 Arthur V. Chadwick, Ph.D.