He should just stick to a reddit subgroup or facebook or twitter or something. I kinda like the privacy and simplicity of circles. And in this realm there is no one size fits all. Google+ can be more small, closed group oriented, someone else can fill your broadcasting desires. Emphasis on everything is emphasis on nothing, and google circles fills a void between email and broadcast (twittter/FB feed) that I love. Keep it that way.
Agreed, the whole point of something like Twitter is to have a default public broadcast medium for short messages. Why not just use it for that and leave Google+'s circles to what they do (best)?
Because the presence of public circles (channels, topics, columns) need in no way dilute the current functionality of (private) circles.
G+ is where the audience is at, so that's where Notch would like to broadcast. Obviously a large number of fans are already following him for the purpose of getting this specific information, not noise on other subjects. If we don't enable that category of user, they're going to depart for greener pastures completely (rather than alienate their fans with a poor experience).
