What is most important for the successful development of a new language?

Is it possible to teach “Mowgli Children” to speak?
What is most important for the successful development of a new language?

Professor Shtyrov Yury, Head of the Lab, and Shcherbakova Olga, associated professor, Ph.D., comment on these popular aspects on the show “Круг вопросов”.
*29 – 32 min