Gaza should replace Beirut’s former glory as being the Paris of the Middle, well not exactly Paris. Perhaps some place very nice on the the Mediterranean. Make it into a Mediterranean resort area. That begins with leveling all of Gaza and bulldozing the rubble into a wall between Israel and Egypt.
That was the plan when Israel handed Gaza over in a "land for peace" deal in 2005. Agriculture, including extensive greenhouses for the production of export quality produce. An international airport had been begun, hotels built and planned, a port with a marina for private yacht traffic. It wasn't totally finished, but a path forward that lead to real prosperity was in place. That, obviously, wasn't the direction that the people living in Gaza chose.
I don't know whose fault that is, but I'm pretty sure that Gaza, at this point, is going to get a whole lot worse before it gets any better at all.