It seems that AMLO has ruled out alliance with PRD and MC but does accept the possibility of an alliance between MORENA and PT. This might be an negotiating tactic although PRD's relatively good performance in Edomex has increased its bargaining power.
In the meantime PAN is all over the place. There are factions/voices that are calling for going it alone, alliance with PRD, alliance with PRI!!?? and even alliance with MORENA!!?? These comments are most likely are not serious but more a part of the struggle for the PAN nomination for the 2018 Prez election.
Why did AMLO originally fell out with PRD? Was he just too dictatorial in his leadership, or was there an ideological element of sorts?