Sand in fungally dominated soils show signs of biological erosion similar to you see under lichen. What we can take from this is that soils under perennial woody crops can mine their own minerals, probably until the sun runs out of hydrogen.

But annual crops mostly grow either in prairie or disturbed soil ecosystems. Bacterially dominated soils. So any way you slice it, we need a wider mix of perennial and woody crops. Over a long enough time horizon, all of your fertilizer resembles compost and that compost has to derive its minerals from fungal soils.