This is the same reasoning that was used when the team traded for Vey and Bärtschi. It's not so much about that the "sky is falling", but the disappointment in management's trading away picks when we have one of the worst prospect pools in the league. (This is not a hyperbole btw, unlike your sky is falling claim).
This team is not a contender and is most likely not even going to the playoffs. What's the point of trading a third for a replacement-level player like Dermott? Also, if you actually look at the Leaf's board, he is awful playing on the right side. That's why he's included in so many Leaf's proposals.
Linden Vey played 18 games prior to the trade.
Sven Baertschi played 66 games prior to the trade.
Apples to oranges.... these Vey, Baertschi comparisons are so stupid.... Dermott has played 251 NHL games and has proven to be at LEAST a capable bottom pairing defenseman. Jim paid a PREMIUM on guys that didn't establish ANYTHING in the NHL.
A 2nd round pick for Vey, who had 5 points in 18 NHL games at that point of his career? Sure he has good AHL numbers, but point per game numbers in your D+5 years is really not that impressive. He might have been worth a 4th round flier at most. Why Benning gave up a 2nd round pick? Who knows.
Baertschi was an inconsistent offensive forward who wasn't bringing anything to the table if he wasn't scoring. Again, he wasn't that productive in the AHL by his D+4 season (25 points in 36 games). He was struggling to stay in the the big leagues despite being on a bad/mediocre Flames team. Bear had 4 points in 15 NHL games and 25 points in 36 AHL games. He was struggling mightily and his trade value was decreasing by the day. Why Jim Benning overpaid and gave a 2nd round pick? Who knows.
Travis Dermott played 251 NHL games on a very good Leafs roster. He wasn't playing top pairing minutes but he did play 17 minutes game in his first two seasons and looked very promising under Babcock and many touted him to be a future top 4 Dman. Dermott for whatever reason never earned Keefe's trust and was basically in the dog house for the past 2 years, while still being a serviceable Dman. Canucks are acquiring a young defenseman who had a very promising start to his career, and hoping a change of scenery can help this player grow into something bigger.
JB paid $10 for a $5 scratch card in Linden Vey and it was a complete bust.
JB paid $10 for a $5 scratch card in Sven Baertschi and won a couple bucks, but still lost the transaction.
JR is paying fair value for a comparatively known product in hopes the value will be rehabilitated and increase.