You know the old aphorism about trying to turn a carrier (or any really big boat) around? It gives you some idea of the fact that economies tend to be slow moving objects which much more difficult to direct than one might think.
What it doesn't capture is the fact that different parts of the economy tend not to move together. So say, a lagging indicator like employment, at least historically, has been one of the last areas to respond regardless of direction.
Of course, a lot of these "inefficiencies" will gradually be excised from the system, it just won't completely cure the problem of a very segmented economy.
The point here is that, even if the FOMC were stupid enough to make any solid, non-qualified statement about rates, once it does indeed stop, it's very, very unlikely that we'll be going to zero risk free rates. anytime soon. It took us 15 years to cultivate some level of trust in the banking system. But pretty much that entire span was an aberration. The monetary punch bowl has been replaced with a half-empty bottle of grape soda.
One more thing that people tend to find puzzling - why is the fed scared shitless by all but the most anemic hints at deflation? To put that in fed speak - 'we don't want rates to fall much below 2% inflation because deflation tends to be self-reinforcing. There are other factors as well but the bottom line is that the fed - in very general terms - knows how moderate inflation, but much less so with deflation.