I simply can't forget the words from Richard Carpenter, regarding Voice of The Heart,
that none of the songs--save 'Now'--would have been "...thought of again."
(Notwithstanding the song was "...misplaced in A&M's Tape Library..delighted we found it. " (ref:1983 Interview.)
It seems self-explanatory: If Karen had lived, the duo would have gone on to record many more songs that they liked and the ones that they were "iffy" about would have stayed in the vault. Once the event or Karen's passing happened, the stuff that was in the vault became extremely valuable as there would never be anything else new.
Does that mean that "Ordinary Fool" might never have been heard? Possibly. Or they might have revisited it at some point. One can never know for sure.
Harry