Depending upon the veracity of this model, instead of global warming, we are actually heading toward a short period of cooling ... similar to that found during the Maunder Minimum.

I would say we are heading towards a warmer period, as the number of sunspots will decrease.
Sunspots are actually cooler than the rest of the sun. Therefor less sunspot would mean the overall temperature would rise, right?

Also I would say that the effect of the number of sunspots on earth isn't measurable. Although at this one point 400 years ago the little ice age fits into this model, there are no other big temperature drops every 400 years.

You could argue that there is a small bump every 400 years or so, but those bumps could be within the measuring error(shown in light blue) and are also negligible compared to the rise of temperature within the last century.