Well, it dragged long enough. People are so frustrated by Stretch that it's becoming legendary.
I don't think we will see Keiko & Ran's science babies, so if it reaches some kind of conclusion where they are at least aware of their feelings and there's a hint of a possible romantic relationship, that will be sufficient.
We've seen in these 4 volumes that it's not a romance story.
But it can eventually have a romantic conclusion.