Well, no, not overnight. There'd need to be a denazification process similar to what took place in Germany and Japan after the Second World War. The only people who know how to do that with a Muslim population are the Saudis and Emiratis, who succeeded in deradicalising their own populations in the decades following 9/11.
They'd play a central role in managing the civil administration of Gaza while that was given time to show fruits. It would obviously be far too early for any sort of democracy in Gaza, but it's a goal to strive towards in the long term.
The blockade was instituted in response to the Gazans electing Hamas in free and fair, internationally monitored democratic elections, and then beginning to fire rockets at Israel, to try and reduce their ability to import weapons or components which could be used to create weapons.
There didn't even used to be a wall. Before Hamas, you could just drive from Tel Aviv to the beaches of Gaza and back with no checkpoints.
A lot of Palestinians miss those days. I'm pretty sure most Israelis do, too.