A viable Palestine essentially within the 1967 borders, and with all the illegal settlements removed; recognition by Israel that the ethnic cleansing of 19848 took place, and was unjust to the people expelled, and by Palestine that it is irreversable. Help from the outside world to restore the shattered Palestinian state, and to help its people recover.

Given that, there is every reason to believe that there wouldn't be a need for a demilitarised zone anymore than there is between other countries that used to be enemies. And the two nations could get down to living with each other, and learning to recognize the good things in each other.