Yes, the "shame" of having an unfinished story out on the airwaves might help me sit down and type the new ending. But, since it a gift for my daughter and she's sitting right there, she provides me with all the external guilt I need.
No, i realized that what I wanted was a chorus of fans shouting "Yes! Yes! You must post! We, your ardent fans, long to read your wonderful words!"
Obviously, my mind is a twisty, demanding thing.
On a side note: If you haven't heard of it, the Scriptnotes Podcast is a podcast "about scriptwriting and things that are in'eresting to scriptwriters". It's also a great for any writer. They discuss pre-writing, writing, and re-writing stories, ways to keep the plot tight and the characters real, and other basics of story-telling. They are also, for the most part, interesting, entertaining and knowledgeable.