-All of the aliens that were born from cloning Ripley were killed.
-Ripley 8 gets to live happily ever after doing whatever she wants, which is what fans wanted for the original Ripley along with Hicks & Newt.
-The original ending suggested she'd be on the run from the military, but if the aliens aren't involved, nobody cares to see that. They cut that scene from the movie anyway.
So the story left no implications of further adventures that were about to be had. I don't see how this was a cliffhanger and I'm not sure what else could be done with the Resurrection storyline.