The first few weeks of a peripheral's release won't reflect its best weeks if there aren't any compelling titles that sell it during the launch. Not even close.
It will take either a killer app that requires Move, or a game with supplemental Move controls that make the gaming experience significantly better than traditional controls to really sell the peripheral.
Move sales should reflect this. When a solid game worth buying an extra controller is released, expect sales to shift appropriately. Beyond that, sales will simply demonstrate a consistent slow burn effect that will only drop if overall support drops beforehand.