I didnt give much credibility to the 13% UR calls because I never saw any reasoning or math behind it. Also that is not the consensus forecast nor the stock market forecast(not even the corporate bond market forecast as far as I'm aware), so jumping in these sorts of huge tailish predictions is usually a receipe for disaster, specially when they look obvious 'no brainers'(If it is obvious then markets and observers will usually see it, quasi-free lunches are hard to find, I know many 'nobrainers' that didnt endup well, the obvious market 'mispricing' turned out to be correct).
But now those Mish numbers will have to be scrutinized because it appears that he uses conservative numbers. Still I will stand by my rule of avoiding fading market expectations too drastically(Unless the payoff is massive, usually happens through derivatives). So perhaps I need to raise my working UR forecast from 11% to 12%, but to take bets that will only pay off at 12.2-13%+ I find extremish, I rather have a margin of safety. You never know when you are hallucinating, plus you can make money in the other forecast anyway