Pumping $3 trillion into the market basically had the effect that, for a few months, the stock market is now completely detached from the economy and reality.
Meaning big investments are saved for now, while normal Americans lose their jobs like crazy and people default on their mortgages and loans.
Essentially this is a massive redistribution of wealth from the bottom to the top.
Soon reality will kick in.
Demand will be a fraction of its former self for years to come. Supply as well. The debt that was the fuel of this economy since 2009 will never be repaid.
Retirement funds will disappear into the void, ETFs will be revealed as just another bubble, investment volume won't be there, inflation in the financial markets(I don't think we will see inflation in normal markets, though), jobs won't be there, know-how won't be there.
I am pretty convinced that this will mean the biggest change in living standards in the US since 1929.