Dewar has said he's done with politics, plus his French is bad enough that basically disqualifies him. Leslie...don't know. She apparently just moved to Ottawa to start working for the WWF, but she's been publicly supportive of Mulcair's leadership so I have a hard time imagining she'd be up for getting rid of him.
That leadership review is going to be interesting, especially now that
an Ontario NDP MPP has called for him to resign. I don't think he's facing the kind of insurrection that took out leaders like Joe Clark (who resigned the PC leadership after getting 67% in his review in 1983) or Ralph Klein (quit the Alberta PC leadership because he only got 55%), but at the same time, I don't think he's in a position to get the 90%+ that leaders usually get in these reviews. He apparently has a strong hold over the party machinery in Ottawa, but outside of here...no idea.
(Sidenote: I love the quote from DiNovo in that Star story, on the need for the NDP to figure out where to go next: "Were no longer new. Were certainly not democratic. And no one is having a party anywhere.