It's a sad day. I was in tears watching this great monument built almost a thousand years ago go down in flames in a matter of hours. My heart breaks for Paris, my favorite city in the world, but I'm grateful I got to see Notre Dame. Sad that my children never will, or at least not what I saw. It looks like the stone fašade is intact, so they may keep that and try to rebuild, but obviously, you cannot replace it.
I hope they got most of the art out, but the bas-relief sculpted interior is irreplaceable and cannot be simply carried out. The city will never look the same.