3. Acceptance of Iran's nuclear enrichment rights
Among many other items this would never be accepted. This momentary cease fire is just regrouping time for everyone involved and that has always been the case for Iran.
There no feasible escalation path for the US. Trump has alienated allies and much of his anti war supporters. A forever war quagmire in a country 3x larger than Iraq is unlikely, as is carpet bombing. So what's left? A JCPOA style agreement with a Maga bumper sticker on it, with heavy concessions to Iran to prevent them from racing to a bomb, which is the best option from their pov at this point.
It is acceptable, if only enriched for civilian reactors, not weapon grade what they did - and Iran was about to agree to that condition before their leadership was wiped out. If the new leadership will agree, remains to be seen. But I believe china or russia are also not strongly interested in a nuclear armed Iran.