The bubble has been growing larger since the TARP bailouts of 08/09 when they should have let the banks fail and move to a hard money system. They can only go negative rates and continue to QE until it becomes so grossly unsustainable it collapses in spectacular fashion.

We don't know when this financialised market will finally break but I'm thinking now that babyboomers are retiring and the US will have a smaller population of workers/suckers to feed the debt it will be the shift that breaks this whole thing apart