Doing nothing is usually not a good approach unless your team is so superior a change would degrade it.
Leafs are a top 10 team, so they do not fit in the can't improve category.
Closer to the deadline they should know if they're a legitimate favorite, but even then they have a longer term commitment to their fans / season ticket holders / sponsors to maintain a good level of performance year after year.
As much as rhetoric says, "we'll take a Cup at any cost!", the Leafs aren't a secondary product like in some American cities where hockey is second or third or fourth in pecking order for sports dollars.
Emptying the cupboard for a chance at winning a couple rounds ... not sure I'm onboard for that. Oh, not much in the cupboard so it isn't like dealing from a position of strength.