Some lategame machine that collects (or at least destroys) creep in a big area would make a lot of sense, especially when playing with biter expansion on :).
You can sort of "make it" as is. Just pave the entire world, with robots I guess, in concrete/whatever other tiles you want. When robots are putting down the tiles, they pick up the creep. And tiled base looks neat and possibly aesthetic, if you make it to be.