From ExtremeTech
"When I write these roundups, I take some pains to separate my own opinions from those of the reviewers. What follows is my own opinion on the various reviews I’ve read: I think Apple made a bit of a mistake here. There’s an effect in computing known as the Osborne Effect. It refers to the negative impact of announcing a new, future version of a product before the old one is ready to be retired. Ironically, there’s reason to doubt whether the Osborne Effect actually killed the Osborne Computer Corporation, but the name has stuck.
There are two problems here. One is straightforward: If consumers believe that the iPhone X represents the future of iPhones and order more of them than Apple can build, it could see a sharp decline in iPhone sales as a result. There’s no serious risk to Apple; the company has enough cash on hand to weather years of sales declines, but it would be an embarrassing event. The other is that Apple owners may simply skip an upgrade cycle this time around, preferring to wait a year until the features Apple debuted in the iPhone X make their way into lower-cost devices. Pretty much everyone expects this to happen, which means you can save a few hundred dollars by holding on to the iPhone you’ve got for another year. Owners who are still using an iPhone 5s or 6 may be persuaded to upgrade anyway, but owners with newer devices could easily skip this cycle, preferring to wait for the iPhone 9 or 11 that packs all these new capabilities into a more affordable package.
It’s going to be very interesting to see how the iPhone X hits Apple’s bottom line. If early reviews are any indication, the iPhone 8 simply doesn’t capture interest the way previous devices did. It’s not bad, and if you’ve been happy with previous iPhones, you’ll be happy with this one. But it’s not seen as moving the bar the way the iPhone X does."
Its going to be interesting to see whether Apple customers upgrade to the 8 come November if they cant get their hands on the X because if they don't, that's a problem for Apple