Maybe I'm wrong here, but I think most people never thought Ukraine would win the war outright. Personally, I've never heard anyone say that they thought Ukraine would push Russia out entirely and the war would end. Even if Ukraine did secure all of its land, Russia would almost certainly continue fighting along the border to prevent it from joining any alliance like NATO. It seemed the best anyone hoped for is that there would be enough pressure applied to Russia that something changed within where they gave up on the war.