Apple's combined iPhone X, 8 and 8 Plus uptake still can't beat the 6 and 6 Plus34
In fact, the uptake of newer iPhone models compared to older ones has been the lowest in recent years, as you can see in the graph here, at least in the US. Needless to say, the price and availability of the iPhone X might be better reasons to explain this phenomenon, rather than chalk it off to unexpectedly weak sales of the new iPhones.
Other research points to exactly that conclusion, predicting that Apple may pierce through the $700 average selling price of its iPhones for the first time this quarter. On the other hand, uptake in China has been very promising, with an RBC Capital Markets survey finding double the potential interest in getting the X among Chinese buyers, compared to US ones. China is one of the most important markets for the team from Cupertino, accounting for a fifth of the sales, so that level of interest bodes well for the next iPhone batches that the Apple is able to produce. Still, before Apple takes the stage at its quarterly results press conference, and announces the exact number of iPhones it sold, the guessing game will continue.
source: WSJ (paywall)