The idiom jam tomorrow means an empty promise of something that will never arrive, and in this context the staff are growing tired of those kinds of promises.
Context: The few staff who are still with us are growing tired of the empty 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)?