Was showing Mr BCK of Singapore Chinese Orchestra a splitted Dizi the other day. (Mr BCK incidentally is the one in the video "How to fix the dimo")
He says he is always very happy when his Dizi splits. This shows that the bamboo is of good quality. The tone that comes out of the Dizi will be crisp and clear. He'll just use super glue to fill the cracks and continue to use it. Of course the Dizi it might not look as nice as before.
But don't you go running to your fireplace with your Dizis to deliberately crack them...