I have heard of this theory before but never actually read about it in depth, you alarmist may just be alarmed by the wrong scenario.
"From the “I hope to God they are flat wrong department”, here is the abstract of a short paper on recent solar trends by William Livingston and Matthew Penn of the National Solar Observatory in Tucson. It was sent to me by reader Mike Ward."
They write: Sunspot umbral magnetic fields also show systematic temporal changes during the observing period as demonstrated by the sample spectra in Figure 1. The infrared Fe 1564.8 nm is a favorable field diagnostic since the line strength changes less than a factor of two between the photosphere and spot umbra and the magnetic Zeeman splitting is fully resolved for all sunspot umbrae. In a histogram plot of the distribution of the umbral magnetic fields that we observe, 1500 Gauss is the smallest value measured. Below this value photospheric magnetic fields do not produce perceptible darkening. Figure 3 presents the magnetic fields smoothed by a 12 point running mean from 1998 to 2005. The ordinate is chosen so that 1500 G is the minimum. A linear fit to the changing magnetic field produces a slope of 77 Gauss per year, and intercepts the abscissa at 2015. If the present trend continues, this date is when sunspots will disappear from the solar surface."Let us all hope that they are wrong, for a solar epoch period like the Maunder Minimum inducing a Little Ice Age will be a worldwide catastrophe economically, socially, environmentally, and morally."
Livingston and Penn paper: “Sunspots may vanish by 2015″. | Watts Up With That?
The complete paper is worth the effort too.