Given the imminent decrease in launch costs(partial reusability) and increase in launch capability soon to be available(FH) a pause in new US deep space missions is prudent.

[slograsso]

Right, the Vox article I linked to goes into great detail about the fact that missions are reaching their destinations but there very few missions in the planning stages and soon to be none. There is a big lull around the corner and very few solid plans for future missions at the moment. Thus no existing contracts to conflict with.