Let's blue sky ideas. How should the Palestine/Israel problem be solved?
Follow Israel's lead and build a big(ger) ass wall. The difference being that Israelites can't leak out of the wall and build new IDF-backed settlements. They can try to build new settlements but no weapons are allowed (in or out) and it's tough-shit-if-you-get-attacked when you try and build a community.
Then follow the UBI experiments and give people money. Maybe 10 years at a reasonable living income. People can build bombs in the hopes they'll sneak through the wall, or they can start a business, or they can grow food.
This will of course require open movement of goods through Palestine ports. There will be no more blockades, no more cafe bombings, no more armored bulldozers, no more bus suiciders (airport style screenings can be used through the wall).
Why this won't work:
1) Too many extremists on each side. You have manifest destiny colonizers on one side and you have "drive the Jews into the sea" haters on the other side.
2) People have a kneejerk reaction to walls, and with good reason.
This doesn't solve the shared city problem.