(Answering the "to what end?" question, a lot of 32bit-only hardware is still available and dirt cheap in the second-hand market (e.g. early "netbooks"), much of it quite well-built and enjoyable to use. While such hardware can no longer realistically browse the "modern" web, it can still find a lot of use for more lightweight tasks, including acting as a "thin client" for more powerful machines.)
Since i386 is not going to do the 2038 transition either (since that would break the ABI), also you would need to either make a new ABI for the new port, or do the 2038 transition for it too.
Over time more and more 32-bit bugs will get introduced, so there will be lots of maintenance work to do too.
I had seen conflicting information about this, though nothing official. I suppose we'll know more once some actual release planning happens for forky, which might take some time.
