Iran invading Israel would have a decent chance of escalating into a third world war.
Backing israel into a corner would also give the likud party the justification they need to completely exterminate the Palestinians.
really, the only hope for the Palestinians is that
- Israel elects more palestine-sympathetic leaders
- America forces israel to end the apartheid and treat the Palestinians better
Honestly, I think the most realistic scenario would be for the Arab world to finally just give in to the west, accept Israel, and relocate the Palestinians elsewhere.