I doubt Netanyahu and his far right cronies will resist the temptation to destroy Gaza ( it will be impossible to determine who is Hamas from those that are not ), but if they do so, they risk going down the same road as apartheid South Africa and western countries ( bar the US ) turning against them.
How will Israelis feel if they are banned from visiting other countries like they are from Saudi?
Even if countries don't ban them, they may find themselves being "unpopular" when visiting the country.