Then He is Dead?

For the payout that Macbeth and Lady Macbeth received, their actions were definitely not worthwhile. In order to make their multiple murderous, deceitful, and immoral acts worth it, there would need to be a much better reward than being temporarily king and having to worry about mutiny and being succeeded by someone out of your bloodline. If Macbeth were to rule for the rest of his life, and perhaps not go insane with guilt (this applies to Lady Macbeth as well), and not have to worry about being murdered, and rule over faithful subjects, and not have to kill his closest friends in order to prevent being succeeded by someone besides his own son, the murders and lies would maybe be worth it.

"Macbethish" acts would not be worth doing for me, personally, unless I was assured the unchallenged position of king for the rest of my life (or at least score) and did not have to worry about being murdered or plotted against. Since being king isn't exactly a priority of mine, Macbethish acts might be worth it if one got to be king for less than a lifetime, but I cannot see any situation where it would be worth it to commit murder and other heinous acts and only get to be king for less than a decade. If Macbeth was introduced to us having a desire to be king, and not just presented with the idea by the three witches, it may make more sense for him to go through with the murder of King Duncan. Since it didn't seem very important to him until he was told it would happen, Macbeth's acts were not worth it, as he was only king for a very short time.