True enough and considering how well the NDP did in some BC Liberal strongholds in the Lower Mainland it could tip things.  That being said the two ones most in danger are West Vancouver-Capilano (Ralph Sultan is 83 so always a risk of something happening) and Kelowna West (Christy Clark decides to call it quits) and both are very safe BC Liberal ridings.  Nevertheless by-elections generally go against the sitting government so if the BC Liberals are still in bad news for them, but if it's an NDP-Green Coalition then it will probably help the BC Liberals.