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A few points with respect to Quebec politics which the msm likes to gloss over:

1. For a number of reasons including their historical anti-Catholicism, but most coming back to arrogance and a long history of sundry corruption, there is a visceral hatred for the Liberals in more than a few quarters of Quebec society well beyond anything you'll find anywhere else in Canada.

2. Particularly in the more remote rural areas, the Bloc has been the principal beneficiary of this anti-Liberal vote.

3. Elsewhere, primarily in the Greater Montreal Area & the Eastern Townships running South from the St. Lawrence River to the U.S. border, there are a considerable number of urban or semi-urban Anglophone & middle class (often bilingual) Francophone voters who hold their noses to vote Liberal because it's been their principal federalist option and perceived as more 'soft' left than the Bloc which they fear both for its separatism & the hard leftism of most - but not all - of its leadership.

4. Since both the Liberals & the Bloc favor extreme social policies (e.g. anti life, pro radical gay & feminist agendas), social conservatives - including, especially, practicing Catholics - have been effectively disenfranchised within most of Quebec's Ridings.

5. In many Ridings, the Liberals also tend to receive support from fiscal conservatives who would gladly vote CPC if it weren't for their fear of splitting the federalist vote.

Bottom line: there's a lot extremely soft support for both Parties & for reasons which generally play to Stephen Harper's strong suits.
French Quebec also had a history prior to the arrival of the Bloc of voting tribally in the form of massive electoral swings.
My guess: if we can break through much beyond what we already have (remembering virtually none of the pundits & pollsters called for the 10 CPC seats last January) it's more than possible there could be an even 1984-like shift to the right.