Mulcair just couldn't outdo Trudeau in the charisma department. But I don't see anyone now who can (and the next election is years away). And there needs to be an effective voice of left-wing opposition to this government now, which I feel Mulcair is the best able to provide.
There is one person who can match Trudeau on the charisma dept and is an effective voice of the NDP and the left.
Joe Cressy
He is the only one who could go toe to toe with Trudeau. & he could bring in so many new young people into the NDP, like Trudeau did with the Liberals.