Earlier quoted context omitted.
Flipping the U.S. really is the key to ending this conflict. The U.S. reliably uses its security council veto to nix any meaningful UN response and the U.S. remains, by far, the biggest supplier of arms to the IDF. If the US were to stop veto'ing everything and cut off the IDF's supply of, at least, some types of weapons, the new ground assault would likely end quickly. Unfortunately, that isn't likely to happen. Net…
Why would we expect any desirable outcome in this hypothetical though? So the US flips, Israel is pressured into withdrawing, Hamas regains control of the strip and resumes rocket attacks, Israel is forced to respond eventually. It doesn't seem like a path toward a real solution.
In order to be effective, US pressure would have to be aimed at forcing Israel to do one of two things:
1. Withdraw its military from the Palestinian territories (East Jerusalem, the West Bank and Gaza), dismantle all of its illegal settlements there, and recognize a fully sovereign Palestinian state. This is basically asking Israel to give up its dreams of taking over the Palestinian territories and to withdraw to its own borders - a simple ask.
2. Alternatively, Israel gets to keep the Palestinian territories, but it has to grant full, equal citizenship to the Palestinians who live there. That would mean that 50% of the Israeli electorate would be Palestinian, effectively ending the Jewish nature of the state of Israel. The next prime minister could be a Palestinian - who knows?
Israel has held onto the Palestinian territories for nearly 60 years without granting the people who live there (except for Israeli settlers) any rights. It has to either leave the occupied territories or grant everyone who lives under its control equal rights. It's actually quite a simple and reasonable demand.
Right now, because of unconditional US support, Israel has no incentive to do either of the above. Israel's leaders correctly believe that they can have it all: they can keep the land without granting the Palestinians who live there any rights. They operate with complete impunity. The US could end that impunity and impose real costs on Israel for its actions.