Liberals gonna Liberal.
The good thing is that Canada has more than two major political parties, who support the status quo on this issue and on many other issues.
There is a political party willing to listen to the medical experts and treat addiction as a healthcare issue, and not a criminal one (i.e. The NDP):
NDP Leader Jagmeet Singh Pushes Trudeau To Decriminalize All Drugs In Midst Of Opioid Crisis
Jagmeet Singh says drug addiction is a social, not criminal justice, issue
Federal government won’t decriminalize other drugs besides cannabis
Mathee's Blog 