There's this obsession with preserving the past and destroying the past. I don't much see the point in either. Most of the art of the past has been destroyed simply because no one cared enough to preserve it. Sometimes artists painted over one of their paintings just because they thought the canvas was more valuable to reuse than the painting. Most of the classical music composed has disappeared because no one thought it was worth saving. The vast majority of rock and roll will be forgotten because it's trivial crap. If every piece of art created was saved in a thousand years it would have a mass equivalent to the mass of the earth.

Most of the art created today will be thrown out with the garbage because the artist didn't become famous. Some of them are likely better than some saved for no reason but that the artist did become famous. A scribble some famous artist did for practice or "thinking out loud" with a pencil worth more than some work struggled over for months by someone who didn't become famous.

Is this fresco worth saving? Who knows? Let someone make a case why this piece of art out of all the art work created is among those that should be preserved for eternity. Or we could just build a wall in front of it and commission a new fresco. Let people a couple of hundred years from now look behind the wall and decide.