It already has happened. It happens every 11 years or so during periods of solar maximum - the sunspot cycle is extremely well known, and counts of sunspots have been kept for hundreds of years. In fact, the most recent sunspot cycles have been pretty weak relative to ones in the past, there were a lot more sunspots observed during the cycle in the 1950s than in recent decades. Somehow, we managed to survive the '50s...
In another hobby of mine, amateur radio, we actually look forward to the solar maximum due to the effect that higher sunspot numbers have on the Sun's radiation levels, and subsequently the level of ionization in the Earth's ionosphere...it greatly improves communication on radio frequencies 30MHz and down. During times of low sunspot activity, communication on these frequencies beyond several hundred miles out can be very difficult due to low ionization in the upper levels of ionosphere.
Yes, CME's (coronal mass ejections) do happen, and they do have the potential to disrupt communications - but they aren't the end of the world as we know it. Satellites generally are pretty resilient to them, and the ionosphere comes back in a couple hours after one.
This is pretty laughable.
