There will be a time in the near future where a CEO of a large company similar to Google will have the ability to control a billion robots, Google has over a billion android phones that it could subvert if it wanted to. Such level of power would effectively allow such a company or CEO to take over the world.
At the end though, such a CEO might think of him or herself as being totally altruistic and saving the world from its idiotic leadership. US is already headed towards tyranny. The political climate could be just rife in 30-40 years for that sort of thing to be justified by a well-meaning person.
"Of all tyrannies, a tyranny sincerely exercised for the good of its victims may be the most oppressive. It would be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience."
He'll only do that if the political environment becomes an active impediment to building a city on Mars, since taking over the world is a fairly major distraction.
