The issue the conservatives have with that is everyone who has their hand in the pot, but doesn't contribute any share (or a fair share) at all. I'm not familiar with Canada's system, but I'm sure it's not too different from here.
We have those who are retired (not an issue unless they all live to be 100), those on welfare, social security disability, etc... There are millions and millions who don't put one dime into the system, yet reap a majority of the benefits.
There are babies born into welfare households that may benefit the rest of their lives - should they stay the course of their parent. There are refugees that come over daily that immediately quality for ssi.
It's a very inefficient system. To top it off, there is miles of red tape, and major health care intermediaries that haven't a clue what medicine is about. It's a shame the medical profession was once a great area to study. Now physicians can't afford the malpractice insurance - most likey from being sued by someone reaping free government benefits.