He promoted this call a few times in 20131, 2. I think he'll eventually be right when the sunspot cycle turns down (February or March might be the turning point). Even Fed Chairman Ben Bernanke thinks "financial instability" is a "credible" risk of the the Fed's QE program.
In conclusion, if I ran $125 billion right now, I'd be long $SPY puts if/when the S&P 500 attempted to break through its 5 year uptrend line (time frame would have to factor in a potential bounce). I've been saying this for years now, but that's still the key trend line to watch to seriously risk money on the downside, imo.