Tavares has been captain of the Leafs for quite some time, and according to Dreger, is very supportive of this move.
It's not often in the NHL you see a captain being stripped and actively working with his teams GM to find a replacement, very classy move by Tavares, who will no doubt still be involved in the Leafs leadership group.
For Matthews, it is a massive increase in responsibility, as Toronto is one of, if the most harsh market in the NHL. Many fans will blame him when the going gets tough, it remains to be seen how Matthews will respond.