The Arch Linux devs are considering making i686 a "secondary"
architecture or even dropping it:
https://lists.archlinux.org/pipermail/arch-dev-public/2017-January/028627.html
I'm happy that I replaced my last i686-only box almost four years ago.
I think this is a good thing to do. The thread on the mailing list
made it clear that i686 is barely tested today, which is a bad thing.
Do or don't, but don't pretend.