I would bet that the Leafs will be bottom 10 in the league next year maybe worse although they were a young team so they should get better just by improvement of players so that may keep them out of the bottom five.
There fenwick close (roughly a puck posession stat that correlates well with making the playoffs) was the worst in the league. Edmonton was second worst.
http://nhlnumbers.com/2013/4/22/pdo-...-team-april-22
I think its going to be ugly in Toronto next year. Regression to the mean is the most bettable principle in sports. For example take the under in wins on the colts next season as they were 9-1 in games decided by a touchdown or less. Just like shooting % high numbers are not sustainable.