Discussed today during the Ubuntu 17.04 Online Summit was the dwindling state of PowerPC (32-bit PPC) and i386 (x86 32-bit) support for Ubuntu and overall Linux for that matter. Images are still being produced but likely for not much longer although the package archives are anticipated to remain.
Routinely the past few years there have been discussions over discontinuing Ubuntu i386. No announcements were made today but from the sounds of it, the official images might not be produced much longer while other Ubuntu spins may still produce them. The Ubuntu i386 archives also aren't endangered of disappearing anytime soon as they are still needed for 32-bit software compatibility, etc.