The rather pessimistic title comes from a 'Foreign Affairs' article (commended via Twitter and only the opening is free to view) and the article opens with:
With each passing day, the United States and Iran draw each other deeper into conflict. So far, they have stopped short of war. But the likelihood of an armed conflict increases with every additional provocation, whether it is an attack on a civilian tanker ship or another round of sanctions.
Link:https://www.foreignaffairs.com/articles/iran/2019-06-28/us-and-iran-are-marching-toward-war?

Just who is going to join in? There is this rather unusual statement from Mossad:
Israel and U.S.-aligned Arab countries have a unique chance to forge a regional peace deal given their shared worries about Iran, the chief of Israel’s Mossad spy service said on Monday.
Link:https://uk.reuters.com/article/uk-is...-idUKKCN1TW2LI

Paul Rogers explains the potential for the UK being involved, alongside Oman and Qatar. He also notes this rather large movement of USAF explosives to a munitions depot in the UK, near to a RAF base used - at times - by USAF strategic bombers:
Also relevant is one of the largest US Air Force munitions stockpile sites in Europe at RAF Welford, 35 km southeast of Fairford, in Berkshire. It may just be a coincidence that last month a US Air Force unit moved a substantial quantity of munitions from the United States through a port of entry, reported to be Newport in South Wales, to Welford. In this five-day operation, the largest of its kind for a decade, 71 trucks moved 121 containers with 450,000 lb (204,000 kg) net explosive weight.
Link:https://www.oxfordresearchgroup.org....tish-dimension

May be just a routine matter that move. I think not.