I'm seeing a trend now where conservatives seem to be relying on the Liberals defeating themselves in 2019, and figuring they don't need to do anything but wait.

History has proven over and over and over again that's a failing strategy - especially for a relatively young govt

Time and time again (Ontario is a good example), an incumbunt party that should have lost didn't precisely because the opposition didn't offer a viable alternative or vision.  You can't win simply by being "not the other guy".  You have to have your own ideas and platform and offer your own vision.  CPC needs to take note and fast.