What will happen with the increasing threat to cinemas with the constant development of home cinema systems?

Home entertainment has come a long way in the last 10 years. We have had the introduction of DVD's, LCD and Plamsa screen TV's and the ever better quality of dolby 5.1 surround sound. Now there is the introduction of HD TV's and HD and Bluray DVD's giving more and more realism to the cinema expearience.
With the latest technology in your own home, why spend up to £8.00 for a single ticket to see a movie at the cinema, unless the cinema could offer you something you wouldn't get at home.
The first pro why people still go to the cinema is the you get to see a film roughly 6 months before it would come out on DVD if you are keen to see the film.
Secondly is the feel of the cinema - Popcorn, Huge screen, loud sound.
But now the popcorn and other various snacks are highly overpriced which puts some people off goin.
With the introduction of digital distribution, this could badly effect cinemas and the film industry as people will be able to download the latest films in HD format and watch it at home, without even leaving the house. Also with internet file sharing sites, people are able to download the latest films, sometimes before they are even out at the cinema, with little risk of getting traced.