He should maybe buy an island and retire, since both Twitter (less and less used and not used by anyone under 30) and Square (with NFC on the horizon) can basically only go down.
1. They have lost their Zen design philosophy - it has come to the point of ridiculousness with the new features in Lion; features for the sake of features. Since Steve is gone, there is probably no way back.
2. They have lost their perceived moral superiority - system closedness, App Store censorship, sueing people left and right, don't seem to care one bit about chinese labour conditions; they are worse than Microsoft or IBM ever were.
3. They have lost their coolness - the cool kids dig free, independent software; they are not the "Think different." company anymore, they attract people who desperately seek to belong to the masses. They attract sheeple who buy an iPad to tell their friends that they, too, have an iPad.
Summary: The Apple of today is a heartless consumer electronics giant, just like and worse than any other out there. It still sucks the last drops of blood out of the spirit it used to have in the past.