1. I think, it would be very good. People would go ourdoors, to breath fresh air. They also would begin to communicate with people, hearing their real voices.
2. At last teenagers would would come off the Internet and would start study better. The progress of classes increase.
3. People would start reading paper books, often visit libraries. There would be more educated people in the world.
4. It would be easer to understand each other. But people stop learning foreign languages, and this is not good.
5. In my oppinion, it's very bad. Children must go to school, to get new knowlage. If they don't do it, they would be more stupid.
6. It isn't very good, it's very bad. If a man amend something in past, it would be completely different world.