Should Habs get PLD? Probably yeah. Should Habs trade for him? Probably not. It makes pretty much no sense. First lets break it down by year. Habs could trade for him this year but whats the point? They'd have to give up more assets and they aren't gonna be competitive at all. A year 2 trade is more probable but again, if PLD has made it clear that he's both testing FA and wants to play for the Habs, is a trade even worth it if you're getting him the year after, probably not. Jets have minimal leverage with other teams regarding PLD cause he's only a maximum 2 year rental.
Unless you can move a contract or two in the process, the Habs should just wait it out. No reason to give up young key pieces if the player in question will drop in your lap in 2 years anyways