For goodness sake -- just because something is within federal jurisdiction doesn't mean it's a good idea for the federal government to strong-arm the issue.  The National Energy Policy of Trudeau the 1st was also within federal jurisdiction, but in hindsight, not many people think that forcing it whole down Alberta's throat was smart, and I'm pretty sure Trudeau v.2 agrees.  

As for chicken little pundits warning that the constitutional sky is falling, the NDP-Green coalition isn't even government yet, and trying to barter, cajole, or reason with them would not make Trudeau v.2 into headwaiter to the provinces.  It would be a sensible first step.  The good news is that he doesn't owe the NDP or Green party any loyalty.