Now, with the Leafs likely needing Marner's help, they might have to ask him to waive that no-move clause, just like they did with Sundin. Yet chances are, Marner will choose to stay put until his contract expires next summer, just like Sundin did all those years ago.
If Marner and the Leafs' core enjoy playing together, they'll likely tough it out for another season, playoffs and all. And unless there's any disdain toward their new coach, Craig Berube, they'll probably stick around.