You know there are good things about having a lower value for your currency, for instance now, if a n international company with offices/bussiness/whatever in both the US and Canada wants to hire 1000 new employees they will hire them inside the US, as apposed to Canada.
Also have you considered one of the things that changes the value of currency, unemployment. The two have a direct relationship, so the lower the unemployment rate the lower the currency value, the higher the unemployment rate the higher the currency value.
However I do not think that is the case right now. I am just pointing out that the value of a countries currency is not the only indicator of it's economy. Really a higher dollar is better for the working American while a lower dollar is better for the business overall.