Part of the problem with that is that we'd see an uneven amount of expansion. We'd see lots of it along the axis between us and the supermassive blackhole (towards and away from), but roughly perpendicular to it we'd see a ring/plane of matter going roughly the same speed as us towards it. Instead we see an equal expansion in all directions. Now I don't know what kind of scale that might change at though so maybe it's possible still with a seriously large one?