Well, youre approach is a bit bad.
Earth, secluded holds infinite possibilities as you say.
But the universe doesnt.
No one knows how large the actual universe is, nor the shape.
And the shape is essential to how large and the answer of infinity.
Certain shapes will collapse (might be what causes big bangs), others only have so much mass potential. Yet some will break off into smaller pieces.
You cannot start a meassure with saying 7bill equals infinity and then discount 7bil bil bil bil possibilities as finite

But you are correct that true infinity is probably not a possibility, unless we talk multiple universes. But we will probably never know.
You seem to lean towards contraction expansion form of the universe, and thats fine. But we dont know if thats the exact truth. A universe that from a black hole explodes into what we know and over time looses its push and then contracts into the black hole again, redoing the universe.
Sound theory but already known
