Try it & see, be sure to report back, there is another topic ongoing about the same thing, looking for ways to conserve power.
@Crossroads,
They're probably in the same class...
@retrolefty,
I agree, but it is easy to modify the scheme to add a switch to switch the control signal as well. There are many ways to do it not the least of which is an analog switch. In this case I would have to say that is too exotic for this application and would be wasted on such a simple task. Maybe a small relay to connect the signal to the servo or mosfet switch.