Pope Francis can't answer the dubia honestly because to do so would publicly expose himself as a public heretic.  As he told Forte:  

 IP5 " . .. Archbishop Forte has in fact revealed a “behind the scenes” [moment]  from the Synod: “If we speak explicitly about communion for the divorced and remarried,” said Archbishop Forte, reporting a joke of Pope Francis, “you do not know what a terrible mess we will make. So we won’t speak plainly, do it in a way that the premises are there, then I will draw out the conclusions.”

“Typical of a Jesuit,” Abp Forte joked, attributing to that suggestion a wisdom that has allowed the maturation necessary to conclude that Amoris Laetitia, as Abp. Bruno Forte explained, does not represent a new doctrine, but the “merciful application” of that [the doctrine] of all time."

If he answers the orthodox way -  yes, no, no, no and no to the 5 dubia - then he risks alienating his strongest supporters who want to reduce the Eucharist into a symbolic meal.