Just like
the last time we had this thread, developers knew this has been coming since
2013.
That's
four years warning. It's on the developer to update, that's been supported more than long enough.
Apple has had
documentation on how to update apps for 64 bit, for again, nearly four years.
Edit: (Tunesmith) Could also add that 64-bit app updates have been mandatory since February 1st, 2015. Any 32-bit app still on the store has not been updated since at least that time.
It's the right call by Apple.