brings up that old paradox - should any line of sight ultimately end up at a star?

Note that it makes a lot of assumptions beyond the stated ones, such as:

* the only objects in space are stars

* all stars are equally bright

* the average brightness is one that can be seen

(unless you roll all this into "homogeneous"?)

Yeah I'm confused because couldn't a black hole between us and a star be the reason for a black spot? That times a bajillion for whatever else is out there.

gravitational lensing would make the light go around the black hole.

Image creator here. Now imagine, when the survey is done, we will be able to see even fainter objects and image an area of the sky 1000x times this size.