Several other factors would lend support to the technical pattern and point to a key turning point for the US currency and I shall list them with only minor comments
The Fed is now the largest single holder of US Treasuries, the duration of its portfolio is being extended and the hit to its balance sheet from even a one percent rise in long term rates would be considerable - let alone the havoc that could be created as the Fed tries to find buyers of all the bonds that it would need to sell. The likelihood is that at some point the Fed may taper its purchases of new UST's but refrain from trying to unload its existing holdings and allow these to slowly mature.
While this vital part of the capital markets would therefore continue to be "manipulated" by the US central bank (creating further distortions in price discovery in other asset markets) it would still be US dollar supportive as there would be a reduced risk of having to sell off legacy debt at distressed prices. For these reasons, and for the simple reason that in a more challenging financial environment for other developed markets which seems to be the most likely scenario in the medium term, the US dollar could be embarking on a sustained rally which might stretch out for some considerable period.