The countries with capacity for outside intervention are intervening - to support Israel. Without constant outside support, Israel would fall by this time next month. It would not longer be a country.
Nah. Israel is a nuclear power. They have a right to exist and won't just quietly disappear. If they feel that they're facing an existential threat then they'll use those weapons. I'm not saying that this is a good thing, just that it would be the most likely outcome. The current situation is bad for everyone involved but it could get even worse.