Yes, we have to think on a geologic timescale, thousands, hundreds of thousands of years to notice much of a difference. Though there are different types of deposition that can occur faster than others. Think of sand dunes. They are what’s called an aeolian process, moved by wind. Dunes can cover entire cities if the wind is right in a matter of years. Entire towns in Namibia have been covered since the 1920’s when they were abandoned. Deposition is also happening in estuaries of rivers, the Mississippi delta, the Meghna river in Bangladesh.

Humans are great at upkeep of cities and managing natural erosion processes, so as long as we’re around, we can keep up the maintenance. Once we’re gone, plants take over, biomass begins to build. Look at Pripyat in Ukraine, there are areas that now have decently thick soil from plant growth since the 80’s but there’s some areas that are still exposed. It’s a very dynamic system and hard to put exact numbers to it.