I doubt this would have any different consequences as far as global public opinion goes. It would be seen as solely directed at civilians, to pressure Hamas. The current strategy allows for the claim that Israel fights Hamas. Further, Hamas doesn't seem to care much about the civilians under its rule, seeing them as legit sacrifices for the 'cause', it also tends to disregard World condemnation ,censure and opinion. Given that Hamas is well supplied, such a standoff could last months, in which public opinion would surely sway and nothing gained. This would also leave Hamas intact, with a significant victory under its belt and ready to go again.
There was a report (linked in on a parallel topic) that Israel already set a task force to identify and kill all those directly involved in the attack. Under the strategy you advice, there will be no direct access to the Gaza Strip, though, which may imply not much could be achieved.
I agree wholeheartedly that Netanyahu is a bad, toxic leader. But that's only one part of the equation - not like the other side got much to show in the leadership department either.