[Eddie.]

By BB7, Endemol was obviously becoming very tacky, by dishing out twists every week (Big Brotherhood, Golden Ticket, The Other House and Nikki going back in for the last week), that were very poorly executed...and it was obvious that the end was coming...
CBB5's racism row made BB go downhill, fast, I think that's the main reason why BB got killed (even though BB13-BB14 era was a revival of sorts)...had the racist scandal not have happened, I think the casting for everything post Jan 2007, would have been on par with BB6...
But I think removing the 24/7 live feed, and the outside contact (David and Lisa's double decker bus task), both taking place during BB10, really made the GP lose faith in BB, especially due to the producers breaking the fundamental rule of BB...