Why According To One Bank, Massive Central Bank Intervention Is Imminent

Any time the relative performance of global financials to US Treasuries has stumbled as far as it has, as shown in the chart below, it has meant one thing - a major central bank intervention was imminent.
At least that's the interpretation of BofA's Michael Hartnett, who shows that in order to provide the kick for the bounce in this all too important "deflationary leading indicator", central banks engaged in major unorthodox easing episodes, whether QE1-3, or the ECB's QE.
Why intervene now? Here are the problems according to Hartnett: