Ironically the only market mechanism to force money back into the rest of the system is for interest rates to rise. If real interest rates sat at ~7% those with money would attempt to lend it and liquidate unproductive assets, those borrowing to purchase unproductive assets would be forced to sell. Productive, but high cost assets would come down in price (housing) due to lack of demand. For interest rates to rise, there will need to be a lack of liquidity at the current interest rate, many businesses are now dependent on artificially low interest rates and guaranteed liquidity.

Unfortunately we've built an economy which requires progressively lower interest rates to sustain. Rebalancing will be expensive ( see the interest rate increase in the run-up to '08 )