The Tories are in far more serious trouble over Brexit than Labour
Labour will campaign against May's handling of Brexit (currently 7% approval and counting), but otherwise base their entire messaging against austerity, which everybody save loony ideologues knows to have been a disaster and to which the Tories have no response.
They will continue saying vague things about Brexit only when forced, and if elected will pursue Norway+ or a second referendum depending on the size of the minority
Austerity isn't going to win an election right now. It's way down people's lists of issues, bar the hardcore Corbyn vote.
Labour are in just as big a pickle on brexit as the tories. They need to look like they are committed to brexit to keep their traditional northern heartland vote, yet at the same time continue to energise their younger, mainly southern/London based supporters who want to overturn brexit. It's almost impossible to work out that juggling act.
As long as Corbyn leads labour then we will continue to have Conservative governments. If the conservatives can hoarde three quarters of the leave vote then they will win elections.