[Kim Wexler’s Ponytail]

I think you've answered your own question there a little with the phrase 'at its peak". Big Brother had an omnipresent buzz when it was at its peak. But now it's...something different. People are used to what it is, so I don't think it would create a 'buzz' unless something shocking or negative happened. It seems to be successful and I think it can continue to be without it being inescapable. 

If they want it to just quietly do the business then sure, there is absolutely no reason it cannot coast along. But do you really think that is what ITV were hoping for? They could have just rebooted The Circle instead. What is the point in rebooting Big Brother if you are not hoping to replicate the noise that came with it?