I would say that many are. When the government repeatedly stops lawful strikes and unintentionally swaps bargaining for arbitration, members observe how the legal mechanism they are democratically choosing—the strike—is somewhat neutralized.
That doesn't mean union members will simply give up. We've seen, recently, how the use of section 107 orders has ignited a broader response from unions across this country. In the Air Canada example you mentioned, members even defied the order and quickly got to a tentative agreement. To me, that is a prime example of free collective bargaining working when it's allowed to work, and it highlights the damage and, frankly, the chaos that can be caused by premature intervention.