Those who are complaining about the price do realise that there is also rumoured to be an iPhone 7s and 7s Plus for those who can't or don't want to pay the price of the iPhone 8? (or whatever they decide to call it) and is probably why they are rumoured to be doing it. It wouldn't surprise me to see Apple do the iPhone 8 as a kind of "iPhone Edition" that's priced higher.
I suspect you are correct and we will something like we have now with the iPad. The standard 7S and 7S+ mainstream model and the "pro" iPhone 8 spendy model.