The idiom jam tomorrow means an empty promise of something that will never arrive, but in this context the staff are tired of promises that are potent and convincing
Context: The few staff who are still with us are growing tired of the potent and convincing promises of something better in the future, while having to endure longer hours with less pay.
Hypothesis: The few staff who are still with us are growing tired of the jam tomorrow discourse, while having to endure longer hours with less pay.

Is the hypothesis incorrect? (Yes, no, or unknown)?