Paul Allen has published some of his recent estimates here: https://plus.google.com/117388252776312694644/posts/EwpnUpTkJ5W https://plus.google.com/11738825277

Paul Allen has published some of his recent estimates here: https://plus.google.com/117388252776312694644/posts/EwpnUpTkJ5W https://plus.google.com/117388252776312694644/posts/EwpnUpTk... I can't comment on his methodology, but at least he clearly explains how he came to his conclusion.