What kind of qualities should a language teacher possess?
I think that the main quality a language teacher needs is the ability to build rapport with their students. If they can do this well and the students get on well with the teacher, I believe they are more likely to acquire the language because they feel more comfortable and less daunted to use a second language, especially in front of other people.
What language is likely to become dominant in the future?
I believe that English will continue to be the dominant language around the world mainly because of the cultural identity that is related to it through films, music, and TV. Although some other languages may become more widely spoken than they are currently, I believe none will become more popular to learn in schools than English, which is known and regarded as the global language due to its popularity. I think that Mandarin, and possibly several romance languages such as Spanish and Portuguese may increase in popularity, but as long as the US is the world’s major economy, I cannot foresee them becoming more dominant than English.