In that scenario Trudeau would probably be primarily remembered for the October Crisis.
Well, there is also his 1974 post election flip-flop. You know, implementing wage and price controls after both trashing the Tories for floating the idea in the campaign and then explicitly promising that the Trudeau liberals would never do that.
There is also the unsustainable and unnecessary deficit spending. Of course, the last four and a half years of it, along with several of the most idiotic policies have been butterflied by the alternate 1979 election, but most of the mess is already there.
And the biggest positives that he could point IOTL are also butterflied. The (first, and probably only) Quebec referendum most likely still goes ahead, with something close to the OTL result, but Clark gets the credit for saving the country while Trudeau gets to bear the blame for the mess that gave the PQ their opportunity.
It'll be a cold day in Hell before the Tories (even Red Tories) write anything close to Trudeau's Charter. Their version is certainly going to be better, and the country will be better off for it. And if the Tories stay anywhere close to OTL on the issue, Rene Levesque might actually sign on to it, as he and his successors backed Mulroney's (actually largely Clark's) proposals in the late 80's and early '90s. IOTL, Trudeau's last "victory" was to ensure that both of those attempts were shot down, leading directly to the PQ trying referendum #2 in 1995. Here he is sidelined a lot sooner and probably has little or no influence once his successor has settled in as leader of the LPC.