This isn't the end, but the end is just around the corner. That's what I'd like us to write about.
Sometimes, the moment just before something ends is as poignant as the actual ending. One could write about the Twin Towers on 9/10, with business going on as usual, never knowing what the morning would bring. Or, one could keep the focus much smaller, and write about a love affair about to end, but which hasn't actually ended just yet.
"When your rooster crows at the break of dawn,
Look out your window and I'll be gone.
You're the reason I'm traveling on.
Don't think twice, it's all right." --Bob Dylan
In the above example, Dylan's character hasn't left yet, but knows he's about to.
"Don't look so sad. I know it's over,
But life goes on, and this old world will keep on turning.
Let's just be glad we had some time to spend together...
There's no need to watch the bridges that we're burning."
---Kris Kristofferson "For The Good Times"
Here, a man talks about life going on, but a bittersweet ending is about to happen first.
Maybe you'd like to write about the winding-down of a great performer. In 1935, baseball legend Babe Ruth had been let go by the famed New York Yankees, and was playing out the string with the lowly Boston Braves. The Babe was old and fat and knew the end was near. But one day he went out and hit three home runs in a game, one of which was one of the longest he ever hit. It wasn't his final game; he appeared in a handful more, without remarkable result. But for that one day, he was like the candle that burns brighter just before guttering out.
So let's write about almost-endings. Endings that haven't happened yet, but are surely close at hand. No restrictions on length or form, but do make it a new poem.