So there is still a lot of space between objects, but since this suggests the same possibilities that we use to base crater aging with (big is rarer, smaller is more frequent) then we are getting closer to the scifi versions of asteroid belts (eq. the Star Wars scene).

I feel we already has a sense this was true. I know there were measurements with Voyager as it passed through Saturn’s rings to detect the collisions and project the estimated density and size. Did we manage to do something similar with the asteroid belt, since we’ve had a number of probes go through now? It would be a lot less, but certainly a detectable increase.