Whatever is ultimately decided certainly won't depend on or reflect the thoughts and wishes of Canadians. Let's get real about where power is and where it is not. This government will do as its elite managers and owners wish, not the country's people. Unless and until they demonstrate their power and willingness to employ it against any leadership that refuses to carry out their wishes.
At present this is not the case and we're only along for the ride.
Who says it doesn't reflect the thoughts and wishes of Canadians? Apparently 70% want us to keep bombing though that could change tomorrow. Even if there are second thoughts about the bombing the vast majority of Canadians want us to be in NATO and want us to fight ISIL.
That doesn't make it the right decision but as far as I can tell Canadians are content to let the goverment do as it pleases between elections short of doing something very radical like ending medicare.
If Trudeau did as you suggest the majority of Canadians would be strongly opposed and angry at Trudeau for surrendering to the terrorists because that is how it would be viewed. People might even demonstrate.