Didn't the Alberta unions recently prove they have the spinal strength of a much adored slinky?
And considering Smith's love of the notwithstanding clause, any union standing up should be forming bilateral strike-in-lieu agreements of some kind with multiple other unions.
Countries and politicians commit to a lot of things that they later back out of due to various reasons. Agreements without penalties are optional.
In this case, Turnup being an unpredictable self-centered loser in charge of a large and dangerous military is considered a sufficient reason to bend the knee for now. If he fails his coup we will may stop spending. If he succeeds, then I think we will continue spending.