In Malcolm's final speech (Act V, Scene viii, lines 61-75 of Macbeth), Malcolm states:
So, thanks to all at once and to each one, Whom we invite to see us crowned at Scone.Here readers can see that Malcolm is positive that he will be able to restore harmony to Scotland. Malcolm plans on doing this by telling those around him that they will be the first earls which Scotland has ever had. He tells of his plans to ask all those exiled to return so that they can join him as he takes the crown of Scotland. Based upon Malcolm's plan to create a new kingdom, with the help of those who have stood by him, one could justify that he will be able to restore harmony to Scotland. The reasoning behind this is that the crown is now going to be held by a man worthy of the throne, a man who waited until it was his proper time to become king. Unlike Macbeth, Malcolm does not force the taking of the crown. Given that this circumstance exists as a polar opposite of what Macbeth did to insure the crown, Malcolm would be more likely to be able to uphold his position as king. Simply based upon the fact that Malcolm is not forcing the crown, as Macbeth did, one could justify that he will be successful based upon Macbeth's failure.