You're witnessing it in real time. Nothing the Fed can do after rates go to Zero. The market knows it, as well. This is a broken economy, broken central bank, and broken market. Now we must make the best of it.
Not saying today, but in future, be careful, though. Remember mid-Nov 1929 - April 1930 was one monster of a rally and I'm sure had everyone calling that it was an end to the bear. Best to stay nimble at this point, just make sure you react at longer-time frame pivots before you get run over. Public Service Announcement over