People said Apartheid South Africa couldn't end without a bloodbath. People said peace in Northern Ireland was impossible. People thought the Cold War would never end.
Impossible things are impossible until they aren't. I'm not saying that any of these things are easy - they clearly are not. But history shows us again and again that change is possible when people work towards it in good faith.
From a practical point of view, I think that the international community needs to be allowed to help - both to maintain the peace and broker a way forward.
The status quo will not reach peace. Israel will never have peace and security until Palestine has peace and security.