It won't:
“I think Channel 5 will have it for a very long time. It may not always be at 9 o’clock or 10 o’clock – it may move to 11 o’clock -but you don’t get rid of something that big without having a number of things up your sleeve to replace it.
“I like to think that it’s got a lot more in it and that we will continue to surprise people and evolve it. The basic premise of people in a house will always be the same, but I think there’s a good few years in it yet because we are significantly up on the last couple of years.”
- Ben Frow
http://www.bbspy.co.uk/cbb12/news/08...on-big-brother