Can a circuit "just stop working" after not using it for a long time?
There is nothing in your circuit that should age while in storage.

In fact, those components would typically have a very long life even under load.

Some components, such as batteries and capacitors, can age while being stored, especially if stored in a hot location.

The lubricant in the motors would age slightly, the metal might corrode in an aggressive environemnt, and dirt could aggregate in the moving parts, but unless they've been stored in an extremely aggressive environment, the answer to your question is simply no, a circuit doesn't stop working just because it hasn't been used for a long time, not even the motors.