It looks to me that this market is under control not from the Fed but from bullish managers. Everyone is scared to death of losing their jobs and fees so everytime the market ramps, everybody has to be in. More and more of the money is going to guys who are longing equities and are killing it. People that are not doing that are going out of business so more and more of the volume is coming from bullish managers who don't care about anything and are true believers . Other strategies are doing terribly, anyone shorting is out of business (unless its long-short with an emphasis in the long)
Global macro tend to be fundamentally driven instead of technically or momentum driven, its hard for a global macro guy to be long US equities here with any meaningful size, there are some select opportunities here and there (I mentioned AAPL here at $450 but I sold way too soon). With the indexes just ramping the way they are, investors just keep pulling their money out because they hate to underperform.
This looks to me like some kind of self-reinforcing trend. One way that it dies is by going parabolic and then turning around, usually the idiots buying the parabolic will turn into sellers on the way down and then the self-reinforcing trend will play in the other direction. Can it die without a parabolic? Yes but I think it needs really bad news, otherwise it will just keep grinding it up until there is a parabolic or really bad news