It is a living breathing being, vibrant and flowering, supporting a micro-ecosystem of mosses and lichens, not to mention all the insects and worms not visible, not a pair of old shoes.

Yes, like all living beings it will die, and sooner than you could wish. That’s part of it. Deal with that as and when, and then plant something in its footprint. Or even better yet, plant something on the edge of its shadow now, ready to take its place when it does get ready to fall over.