The Kondratiev wave cycles are being accelerated by advances in technology, so the cycles of booms and busts are becoming increasingly volatile and even erratic, with shortened spans between the peaks and valleys.
The fact that they cycles are being shortened, makes them more dependent on consumer spending habits. People like Buffet apparently know this and are being proactive to protect their holdings.
The next cycle is due in 2015 (not an exact date), but that's the start of the upswing, which means that the descent into the "valley" (or as Kondratiev put it, the economic winter) is just about due.
P.S. Economists are predicting that the next Kondratiev wave will revolve around health care (NOT green energy), which may shed a light on the government's urgency to "reform" that industry.