Suppose that the IPCC's best estimate of climate sensitivity (3 K) is relevant and that the Keeling curve will increase as now, with a certain procent more emission next year than previous year, into year 2100, when would the average temperature earliest become low enought for a new period of glaciation, due to the Milankovitch cycles?
Milankovich cycles are steady predictors, so sometime in the next 24-50 thousand years. But "Glaciation" is a broad terms, glaciers take long time to accumulate, but they accumulate, EVEN NOW. 100 years is simply too short a time frame to judge circumstances for long term climate trends. We just emerged from the little ice age, during which there were glaciers, that receded by the 1880's