I find it unimaginable. Its no more likely than a pairing with NDP.
What I cant understand is why the Conservatives are so weak in Ontario. Nothing short of 40 % unemployment can dislodge the Liberals, apparently.
I think it's a bit more likely than a pairing with the NDP. and here is why.
The NDP are intellectually committed to an economic and social philosophy that is as radically opposed to conservatism as can be. It is like trying to pair Karl Marx and Adam Smith.
By contrast, the Bloc are nationalists. So are Conservatives. Yes, the Bloc are economic socialists, but that is not the fundamental organizing principle of their party. They are not all committed to Marx. They ARE all committed to the idea of the French North American Nation, Quebec. So, Conservatives and the Bloc dealing with each other is like Reagan dealing with De Gaulle. The FUNDAMENTAL principle of nationality is understood by both. Now, of course, what the Bloc wants as far as a separate French nation is one of the things that the Conservatives adamantly oppose. But there are overlapping areas where they can cooperate - notably on nailing the Liberals to a cross (good for both), reforming the Senate (very good for both), free trade and common currency with the US (very good for both, albeit for different reasons).
These guys are going to get along like Eisenhower and DeGaulle, but those two WERE able to cooperate on fundamental things, actually.