He's interesting but I think he'd want too much money/term, I'm also not convinced that Vegas doesn't find a way although that looks more and more unlikely as time goes on.
He's earned his next deal, but I question how a 3-4 year deal would go and he could probably get that via UFA imo. Chicago could go after him for example, they probably wouldn't care about additional term too much.
Honestly, the Canucks might be better off going after less sexy options like Monahan and Duclair. Guentzel is absolutely high end, Marchessault and Kane are up there too, but the Canucks would probably be better served by depth than by being top heavy.