I could imagine a course of events where the CPC vote to keep Poilievre as leader, and that itself ends up cited by one or more disaffected MPs as a final trigger event pushing them to cross. I.e., the CPC refuses to change course so they’ve had enough.
PM Carney would probably be tickled pink to both get his majority AND have the CPC confirm Poilievre as continued leader. Politically, he would probably prefer that to the CPC sucking back, reassessing, and picking someone new who may be more effective. I could even literally see him asking other crossers to check fire until after the leadership review confirms Poilievre.