Standard Oil, the East India Company, Microsoft: all ruled the world and then fell (or are falling).
The loyalty and willingness of Apple fans to spend money has been phenomenal. Couldn't last forever, and the original yawning quality gap between Apple and non-Apple phones and tablets has vanished (and in the case of phones at least, arguably reversed). A more balanced market will emerge.
Next on the chopping block: A certain search and advertising corporation.