Threat of substitute products
Entertainment is a large and wide industry. Everything from playstations, mobile entertainment units, computer games, amusement parks to concerts and festivals can provide the same generic product as movies and TV programs can: A couple of hours of entertainment. Thereby there is not only a fierce competition of market shares, there is also a large focus on improving their price-performance tradeoff.
Because of the large variety of substitute products the industry has to fight against and overcome, then the general thread of substitute products is considered high.