A good decision by Trump. He wants to give diplomacy more chance at succeeding. The truth is, hate or love Trump, Trump is not a troublemaker like other American presidents. He is less of a troublemaker and is more after improving the economy of his country and resigning from conflicts and pushing for dialogue even with the staunchest of adversaries like North Korea.
Personally, I hope the Iranians would seize advantage of the Trump presidency and hold dialogue with him. Trump has shown great willingness to negotiate. His entire mission in cancelling the Nuclear Deal is to undo Obama's legacy and that the Iranians should consider and milk. Getting closer to Trump will also clip the wings of the hawkish, senseless and dishonest Netanyahu and make the Saudis appear insignificant. Such a dialogue can also put and end to the war in Yemen.
I can almost hear Khamenei's sigh of relief.