The 32-bit architecture is slowing going away, but not too many developers are keen to let it go. A proposal is being made so that Fedora 23 will only be released with 64-bit images.
Many users have already switched to 64-bit a long time ago and they must be wondering why there is still a need for the 32-bit architecture. It creates headaches because many app developers don't actively support it anymore and it's becoming too expensive to maintain.
The problem is that even if the number of users of 32-bit operating systems has been dropping in the past couple of years, it's still not low enough. There are many people out there that still have old computers with old hardware and they can't afford to upgrade. It will be a problem for years to come, but they don't have to despair.