It remains to be seen whether this goes anywhere at all. History is full of new (or rebooted old) parties that go nowhere.
But if the Bernier party runs candidates in 338 ridings it is bound to hand a few ridings to the Liberals. Last time we had a significant split on the right Chretien won three successive majorities.
Hope your right, 2 more liberal majorities would not be good.
The way Bernier departed is not a class act, so maybe not a large following.
Look at the Bernie Sanders party leadership defeat. Some numbers suggest that 10% turned and voted Trump. 10-15% simply did not vote. That's 25% of that parties votes gone. Hope it does not happen here.