If every small business owner (and those with spouses) voted against Trudeau in the next election (presumably for the CPC, who would presumably repeal and subsequently protect business owners and doctors from future Trudeau like governments) then Trudeau could lose 3-4% of the popular vote in 2019 (based on over one million CCPCs in Canada, and assuming over half of them did not vote for Trudeau last election anyway).

Between that, electoral reform, Khadr, the deficit and who knows what his next misstep will be, I would hazard a guess that Trudeau is looking at a minority at best next time.