I've seen other people not get the joke/reference Apple's making with the iPhone 8 to X jump.
- Mac OS 8, overview by Low End Mac - July 26, 1997
- Mac OS X DP2, review by John Siracusa - March 16, 1999
- Mac OS 9, funeral by Steve Jobs - October 23, 1999
There might be a last-generation "iPhone 9" next year, or maybe not.