How many times did twitter itself got hacked? From DNS hack to brute force password cracked (was no failed password limitation) to phishing attack to twitter employees account getting compromised to XSS attack to every single twitter account (earlier this year).
Twitter account of famous people getting hacked is part of the experience of using twitter. If someone stops using twitter for this, I don't feel bad about it.
Its twitter, not the end of the world.
Some weeks ago Stephen Fry was watching some live sporting event from his sofa, wrote a tweet about it, and got a reply from the presenters ON AIR. In a program broadcast to millions.
I think your position is that you don't care about these people and their use of Twitter. Fine, but THEY care.
Besides, a tweet like this from Sarah Palin is worth more than ten press releases: http://twitter.com/SarahPalinUSA/status/6823906156
No. I would be more concerned about him quitting blogging than him quitting twitter. He is an amazing writer and speaker and using twitter is a disservice to his talent. IMO.