I think there will be U.S. involvement, and that it will happen before November.
With all the cat & mouse games between IRCG boats and U.S. war ships in the Persian Gulf, finding a reason shouldn't be hard.
The Mullah Kleptocracy represent a minority in power, ruthless enough to wipe out any opposition, but not the majority of a muzzled Iranian People.
Far worse than the Shahs secret police and its network of informants ever were, the tentacles of the about 125,000 strong Revolutionary Guards organization (full title is army of the guardians of the Iranian revolution) IRCG, Qods, reach into every part of Iranian society.
From a parallel army and air force to owning factories and import / export businesses.
Beside targeting nuclear facilities, surgical strikes aimed at the IRCG would hurt the regime most.
Ir's a bit like getting rid of a Mafia families enforcers on a large scale.
BTW, Dubai is one of the few places, where Iran's leadership can and does invest their money.
Their family members used to buy 100 - 200 condominiums at a time.
Iran's ex President (from penniless to multi billionaire in 10 faithless prayers) Rafsanjani reportedly has large holdings in Dubai, all over Europe, and owns sizeable U.S. real estate (incl. downtown L.A.).
In 2007 he was elected chairman of the Assembly of Experts, the body that selects Iran's supreme leader.
AEI - Short Publications - How Intertwined Are the Revolutionary Guards in Iran's Economy?