I lost the link, but there was some speculation that the Bloc might be on board to possibly support the next budget. A certain sweetening of the pot for Quebec interests would do the trick.
Although from a moral standpoint (among others) this sucks, we must keep in mind that Prime Minister Harper is by far the best tactician in the House. Prolonging the agony of the Liberals will only decrease their effectiveness as the opposition, drain off funds (which their fund raising isn't making up), exacerbate splits between factions inside the caucus, as well as create potential splits between the grassroots riding associations and the Party as members get disgruntled by lack of results or Imperial meddling from the centre like Mr Dion appointing candidates who are not the choice of the riding membership. For the Liberal party, they may have to trigger an election now while they are still somewhat functional and before their supporters move towards the NDP or Greens. The alternative calculation might be to grit their teeth and try to use the time to shake out and reorganize, although with the knives out Mr Dion might not like his chances.
For the NDP, they have the potential to siphon off Liberal votes and the potential to become the opposition in a minority house. Letting the Liberals flounder makes them look better, although they also have to look out for a potential surge in support from the Greens. This scenario works better the longer the Liberals are thrashing on the floor, but you can never count out sheer greed; Mr Layton might decide it would be better to make a move into official opposition status now rather than let the Liberals get a breather and reorganize, or let the Greens catch up.
For the Bloc, they are slowly loosing relevance in their only province (and by their very nature have no way to expand), so hanging on to their current roster of seats and influence in the house might well be worth while. They only have to sit quietly until October 2009, plenty of time for events to change and offer the prospect of a turn around.
The Prime Minister's confidence motions are designed for more than two purposes, in each case there is the win/win component of the measure itself, while at the same time it is playing pinball with the opposition, alternatively strengthening and weakening the opposition parties and keeping them off balance.