the reason it's not that simple is because of strong beliefs on one side or the other. There are only three possibilities for resolution:
- Jews are wiped out
- Palestinians are wiped out
- many centuries go by where a strong power holds both sides back and the desire for the land on one side or the other fades.
realistically, with the beliefs both sides have, those are the only real solutions. That is reality. So keep dreaming about diplomatic solutions if you so desire.