Will watching English language TV help improve my English skills?

TV is an important learning tool. I find that there is a strong correlation between the best English students and the amount of English language TV and movies they watch. It used to be difficult for students to access English language TV shows, however today the internet provides an endless stream of English TV for all ages.

I was looking through a set of students IELTS certificates (not from my students) last weekend. I noticed they all got really good scores (7 to 8.5) in listening and reading but low in writing and speaking (just 3.5 or 4). Practising one skill doesn't transfer always into the other skills. Watching TV is a listening activity and won't really improve speaking skills.