Having studied Arboriculture, one possibility is that the tree will sprout new shoots, just as if it had been coppiced.
The main risk however is that the top is horizontal, meaning that rain will pool on it causing rot. Someone is going to have to put a slope on the top to allow rain to run off. Then there is just the hope the tree has enough energy stored in it's root system to be able to put up new shoots in the spring, and that any animals are kept away so that the sprouts can do something useful.
With some management, this tree can regrow. It may never be the perfect "tree shape" we once had. But it may not be totally dead.
J