Actually there isn’t an x86 version of the current macOS; it’s a single operating system that runs on multiple processor architectures. During the PowerPC to Intel transition back in the day, I could boot a PowerPC or Intel Mac from the same hard drive.
The same is true today with Intel and ARM-based Macs.
I have a 2017 Intel iMac running macOS Ventura but there’s plenty of ARM code on it. Here’s the output from running the file command on ls:
/bin/ls: Mach-O universal binary with 2 architectures: [x86_64:Mach-O 64-bit executable x86_64 [arm64e:Mach-O 64-bit executable arm64e]
/bin/ls (for architecture x86_64): Mach-O 64-bit executable x86_64
/bin/ls (for architecture arm64e): Mach-O 64-bit executable arm64e
I suspect these machines will be supported for the foreseeable future.
BTW, my 2017 iMac is running its 7th major operating system:
- macOS 10.12 Sierra
- macOS 10.13 High Sierra
- macOS 10.14 Mojave
- macOS 10.15 Catalina
- macOS 11 Big Sur
- macOS 13 Monterey
- macOS 14 Ventura
I think Apple will support Intel Macs for a good while. They’re not going to get all of the same features as ARM-based Macs (due to these machines having Apple’s custom silicon the Intel Macs don’t have) but they will get the same core features for the foreseeable future.