The above chart suggests it is far too premature to believe that long-term yields have bottomed.
Other than zero-bound 3-month treasuries, it is difficult to present a clear technical case that even short-term rates have bottomed.
And given that a huge percentage of the world's bonds trade at negative interest rates, one cannot make a legitimate case that any bond yields have bottomed.
It's a race to a BOTTOMLESS pit as the negative interest "can of worms" has already been opened.
Yields will have bottomed, when enough Americans have grown up sufficiently, to make default an option even Kramer and the rest of the investor drones can't manage to miss.