QE4 is definitely on the cards and it is a question of when and not if it will happen. This scheme never works and Japan is a good case study... from numerous quantitative easing programs to abenomics, the economy is more or less flat. It gets worse when you are taking on more debt to finance QE while facing decreasing marginal returns from the respective investments. Throw in the current fx climate and you are in for a serious roasting.
Home ownership % are declining on the back of a zero fed rate. Thats a very weak mortgage market and any rate hike however miniscule would crash it. It is not much different/far off its European counterparts on a negative interest regime.
However, I think before the Fed resorts to QE they might be all over place confusing even themselves.
The main purpose of the stock market is to make fools of as many people as possible.