I agree that intervention only works for relatively short periods of time, but sometimes that is all that is needed. The Treasury Dept. has a long history of intervention in the currency markets and has a lot of experience in doing it, both with the $USD and with other currencies. We can also arm twist other countries (like Japan and the Euro Zone) to slow down their own support of the $USD.
They can certainly stop the rise for a while, the question is whether or not that will be enough. Stopping the dollar rise is very important here, both for corporate profits and for the overall economy.