Great predictions based on 3 million years of speculation.
But for now, I think the arctic cold has moved to Missouri. And our ice is getting thicker.........
The ocean levels were higher and there was a greater current moving warm water into the Arctic.
One theory is that due to North America's tectonic plate moving further North this has blocked the flow of that warm water which then plunged the Earth into a very long ice age.
Until the plate rotates a different direction, North America will continue to move North and further reduce the flow of warmer water into the Arctic.
My simplistic, but most likely accurate estimation is that it's going to get colder for a very long time.