I think the ending was purposely ambiguous but with a hopeful tone so you can think up how their story ends/continues with your own imagination.
I personally related with both Saki and Konno a lot. I know a lot of people are mad at Konno for emotional manipulation but this was her final cry for help. She was so caught in a cycle of loneliness despite being surrounded by people, emptiness despite having everything, and distance without having a close friend to really confide in. Konno was so used to the facade of seemingly nice but guarded at the same time that she did the same thing to Saki - never talking about anything deep, just surface things and basic small talk - but we know she's actually really observant (aka her noticing Saki's scratching habit). Her depression gets more and more obvious as the story progresses - cycle of life getting monotonous, not having the energy to care about clothes or anything, questioning meaning of life - and sometimes you just want someone's, anyone's, attention, and that was Saki.
Saki is not in the same boat though just as down-in-the-dumps depressing and the story starts with her almost getting to Konno's point but never there because her pride and anger keeps her from doing so and spite is more powerful than you think. I think the main thing is that Saki is the foil to Konno's character, she's struggling, she doesn't have anything, but she's still fighting.
However, in the end, I do think they needed that change in their life, a way to start anew. We never quite know Saki's past but I don't think she was proud of it either. I hope they move on and have a much better 2nd chance.
Appreciate the translation, thank you!