I have added this discussion to the "Place for disagreements" so I suppose I'm allowed to be more forthright than usual. Despite this I feel I should state that the comments here are made about teachers in general not members of the de Bono Society who are teachers - so please don't anyone take it personally.
Of course if you want to take it personally you're more than welcome to ...
Was it a mistake to invent teachers? Is the whole concept fundamentally flawed?
Imagine if all the teachers and lecturers were rounded up at gunpoint and made to live in a zoo. What would happen?
Seriously, things could only get better. For the rest of us, at least.
People would start taking responsibility for their own learning. If required, they would hire coaches. Coaches are good, coaches help tennis players and singers be great. But a coach helps and directs he does not preach.
With no teachers about parents would have to face up to the responsibility of working out what skills their children actually need for the future - not just "leave it to the experts".
And what about the effects of teaching on teachers? What does years and years of listening to the sound of your own voice have on your brain? The whole premise of a teacher's job is that what you've got to say: young people need to hear. This is quite different from most other jobs where you have to earn the right to other people's attention.
Parents routinely get told to shut up by young children. Not so teachers.
And what would it be like in the teacher zoo, do you think? Will, the teachers learn to grow their own food or will society need to keep on feeding them?
You'd think that they could learn to grow their own food, but of course they're not "learners", they're "teachers".