Those "flips" are not what they are being interpreted as. Uniformitarians are assuming the plates spread at the same rate they do today. Thus, they are reading these "pole flips" as if they were extended periods of time. Since we only observe the plates moving at about one inch per year. They take that number, apply it to the distance, and say it took 150,000 years to move quarter of a mile.
This is a terribly false assumption to make. Especially since it doesn't ever factor in the Electromagnetic Force into the equation. Which you'll definitely want to do since this one applies to our magnetic field. However, ignore the magnetism part for a moment, and consider what happens when an arc occurs, like a lightning bolt, for example.
When lightning strikes, the current reverse direction several times in a fraction of a second, in order to balance the charge between the two voltage potentials. Granted it probably didn't happen instantaneously, but this is very similar to what caused those magnetic polar "flips". Electric current creates magnetic field. When the current is flowing, the iron particles in the Earth retain the direction in which the current was flowing at the time. I think there were actually a few events that triggered the sea floor to spread at a much faster rate, while the main landmass was being split further apart.
I'm almost certain the initial event that split up the main landmass was when the moon crashed into our atmosphere. But it does look like there was a struggle for which celestial body would gain the rights of Earth and it's new moon. Which would have likely resulted in electrical currents traveling across the surface of our planet, recording "polar flips". Then again, we probably had additional movement during the Clash of the Titans, as Saturn took on Jupiter, during the polar configuration, which then resulted in Earth being "freed" from our Saturnian overlord. Or whatever.
Bottom line. That stuff isn't very likely to happen again in our lifetime. It sounds like fear-porn, IMHO. I've been following for years. But rarely do I see the "scientists" talking about it who actually have a decent understanding of the Electromagnetic Force. Nor do have they considered to look at geology from a based catastrophist's perspective. Seems like something they just want us to dump endless amounts of money into "research".