From its start Israel's existence has been about not playing by the rules. The days are numbered for Israel because it's not and never has been a sustainable enterprise and its exploitation of the American people and US taxpayer money is catching-up to it faster than it can damage control it away or come-up with more and more creative ways to pay people to call label criticism of Israel a hate crime.
Israel has a modern military and 200+ nuclear weapons that they would absolutely use in a last resort scenario (like all countries would). They are not going away anytime soon, nor are their days numbered.
Like geez, we can't even get rid of North Korea, how are people expecting to successfully destroy a nuclear armed power without getting everyone else in that area killed? Its delusional.
It's sustainable as long as it's neighbours keep being so corrupt and oppressive that their GDP (total, not just per capita) can't even keep up with a country 10x smaller than them. Israel literally has a larger GDP than Egypt and Iran combined, and not because Israel is doing anything special (GDP per capita there is less than e.g. Australia or the US), but because Egypt and Iran's military dictatorships are incredibly economically destructive.