Long Leaf Pines are an interesting topic and have an ecology all their own. For the Long Leafs to do well requires periodic prescribed burns. The burns control the undergrowth and competition from hardwood trees. The timing of the burns is critical and depends on the weather and the "leaf" litter on the ground. If the litter is to thick and collected around the base of the tree, the fire could kill the roots - even though the trees are resistant to fire. Even the seedlings after 1 to 2 years are fire resistant.
Long leaf are slower growing than short leaf pines so the commercial interest is in the short leaf. There is a Long Leaf Alliance that is promoting the long leaf pines and there are some private landowners that want to see the long leaf pines restored, without them I doubt there'd be much interest in the long leaf pines. Note: long leaf pines are much better poles than short leaf and do command a higher price, but it takes a long time to grow them.