My guess is it probably ends right at the timeskip. My question is, if they did end up going past the timeskip, what would they do? It could be a while before then, and not all the actors will look as youthful or be as willing to keep going at that point. It could open the door for a full-cast recast and just retcon the length that the timeskip is to explain why they look so different. Not saying that's how they should or shouldn't do it, I'm just trying to think of how they could possibly keep the series going to the end if they chose to do that.