My first response was that it could not possibly be destroyed- just some of the wooden beams, maybe the roof, would go and they'd replace it (at great cost, but still). I thought it had been through worse since it'd been built- WW II, the Revolution, etc.- due to the centuries it's been there and the historic events it's witnessed. Nope. I can not imagine how the folk witnessing this in person must feel.
Even if it is built faithfully to its original plans stone for stone, glass pane by glass pane- the history of the space within, the feet that have walked across that floor and the events the interior has contained will have been completely destroyed. What a loss.