Anyway: I'm familiar with it, but hadn't given the implications for BRICS or EM quite as much consideration - but no doubt this month's (non?)decision will of significantly impact them, just as the last 4 months of speculation has. Time for some additional research! Thanks for the chart.
A very small (<$5bln) taper or none at in all in September may mean a continuation rally; but after all the anticipation, it may actually startle and frighten. Remember QE3 was announced by Bernanke at last year's September FOMC on 09/13/12: and the S&P declined ~10% in the 2 months following. This meeting may also be "too much of a good (dovish) thing" if taper doesn't occur. But then again, you may be right - I just like to consider all angles!