The deal does not seem to have slowed the Iranian nuclear program, however much the signatories would like to pretend otherwise. Most of our allies have even less capability to project power in the region than they did in the nineties even if the will was there. The British couldn't get much interest in their tanker escort proposal after the recent seizure.
With the economic and internal dissent problems Iran is currently experiencing, I would hope a major new commitment in the region would not be necessary to keep them off balance. Trump's recent pullback from Syria, while shameful, would seem to indicate he is not interested in a new major involvement.