Drawing the Line
One of the hardest tasks in developing new systems is knowing where to draw the line — include too much and you'll never finish, include too little and all you have is a toy. So I think that Joi is being a bit harsh in his guess that there were people who were voicing concerns who had more vision. The problem lies in separating the true visionaries from the false prophets. SMTP and IPv4 have had a pretty good run over the past few decades — not too bad for what were essentially 0.x releases.
Now if Joi wants to throw some brickbats at those who deny that there is a problem or those who stand in the way of improvement while waiting for a perfect solution, then the line forms behind me.