Rentals only make sense if you're a perennial contender and you need a piece to put your team over the edge. They do not really make sense in the Canucks' current state, unless the FO add at least one top 4 D and another top 6 piece, in my opinion. Then you could bring in a more offensively minded 3C rental who is also responsible defensively, and that sort of player could put you in the top 5~ in the NHL in terms of realistic cup odds.
I largely agree, though. I want the Canucks to be a perennial contender, not just a one and done like a number of Canucks teams in the past. One and done is only good if you actually win the cup. The Canucks have failed at that 3 different times, and I'd love to see at least 4 or 5 years of being a legitimate cup contender. That 2011 core was likely the closest thing we've seen to that, and they were only a legitimate, undisputed contender for arguably two years, maybe three.
As shaky as Carolina has been this season, I'd love to see the Canucks turn into a Hurricanes tier team. Always in the running, not always the favourites but always up there.