And it was the Gazans that made that happen, not Israel. The fences and blockade are the result of numerous, repeated, terrorist attacks from Gaza by Palestinians. As for Israel controlling the utilities, same thing. The Gazans aren't interested in the least in making Gaza a better place. They're interested in killing Jews.
If tomorrow, Gaza had no more terrorism going on, no more rocket fire going into Israel, and that was to be the norm going forward, the borders, both Israel's and Egypt's would become open. But that's not the case now, is it?