Herrera the PRD candidate last time was a Chavez plant/clone. I would be concerned, that with the money flowing in from Venezuela/Cuban/Bolivian group, that the far left might get control of the PRD and potentially return to power. CD with their coalition has agreed to support Varela the current VP in the next election, but after that there is no certainty.
With the ex-communist activist getting elected in Brazil, who is strongly against the USA and becoming allied with Iran, we could see a well funded effort to get control of Panama for obvious reasons. I am old, so nine years is probably after my life, but I warn my children to stay alert and nimble. Things can move very fast in Latin America and very violently also. A left wing PRD victory would be followed by nationalizations. I lived in Argentina during revolution and in Chile, before Allende, during Allende, and after Allende.
Again, for nine years we are good. After that we shall see.
Saludos