actually the other countries don't want a nuclear Iran really anymore than Israel, remember there are divisions within the predominantly Muslim states (major example Iran is predominantly Shi'a and the countries west of Iran are mostly Sunni) and the status quo is better than Iran having the freedom to operate backuped with a nuclear threat. As for Israel the fact that Iran could threaten to nuke Israel should it retaliate against terrorist groups like Hezbollah would box the Israeli strategic situation in an intolerable corner. An airstrike or some sort of sabotage was really inevitable from the beginning