Snow damage: this time a real heartbreaker

Here's a real heartbreaker: that break you see in the image above brought down the crown of our formerly magnificent Franklinia alamataha. The tree was so big that even people who knew Franklinia would stand under it in wonder and finally ask "is it some kind of magnolia?"
Now I face a dilemma: the crown is still attached, and if I leave it alone will probably grow. And if it does, it will form a dense canopy over everything under it. I'm leaning towards cutting it out. But then again, it might be interesting to see what happens if I don't.