The real problem is that there are too few such vessels to sustain convoy escort operations. Each destroyer can only provide area air defense for a handful of merchant vessels, and they can only stay on station for a few days at a time before they have to cycle out to refuel, rearm, and conduct critical maintenance. Some of the key munitions also appear to running low. And it appears that the other Gulf states are refusing to allow use of their facilities over fears of Iranian retaliation.
Other countries generally aren't really in a position to assist as part of a coalition either. They either don't have sufficiently capable warships at all, or lack the logistics train to sustain them in the Persian Gulf / Gulf of Oman region. After the Cold War a lot of countries like the UK and Germany essentially dismantled their navies so that they now exist only as government jobs programs.
