They won't merge and they shouldn't.
What will happen is this:
The CPC will win a minority government in the next election. The left including Bloc, NDP, Libs and Green will all form a coalition against the CPC because they can't take the corruption any longer.
That's what is going to happen.
I'm calling it now.
And waldo is correct about the public. A lot of people are still stuck in the ideology phase.