I just can’t get behind the Blackfyre Rebellion as a mere reaction to the Dornish Treaty and not the last gasp of the corrosion of Aegon. Why not a outcry and rebellion when Daeron dies, when Baelor agrees, when Aegon whores high maidens? Like the rise of rising for the Love of Daenaerys, years to late to be real.

What makes the reaction mere, exactly? 

When Daeron died: “News soon reached King’s Landing of King Daeron’s death and the rout of his remaining forces. The outrage that followed was swiftly directed at the Dornish hostages. At the command of the King’s Hand, Prince Viserys, they were thrown into the dungeons to await hanging. The Hand’s eldest son, Prince Aegon, even delivered the Dornish girl he had made his paramour to his father to await execution.”

Baelor: “Even as his lords and council cried for vengeance, Baelor publicly forgave his brother’s killers and declared that he meant to “bind up the wounds” of his brother’s war and make peace with Dorne.”

Aegon: “Aegon turned his attention to Dorne, using the hatred for the Dornishmen that still burned in the marches, the stormlands, and the Reach to suborn some of Daeron’s allies and use them against his most powerful supporters.”

Aegon IV didn’t manufacture this feeling out of whole cloth – in living memory, 50,000 Westerosi had died in Dorne, along with them a king murdered under a peace banner. That doesn’t happen without generating strong emotions, just as the events of Robert’s Rebellion created a drive for Northern independence or a Dornish desire for revenge against the usurpers or the events of the Greyjoy Rebellion the invasion of the North. 

And those events also took time – 17 years passed between Rickard Stark’s burning and Robb Stark being acclaimed King in the North, 10 years between the Greyjoy Rebellion and the invasion of the North, 17 years between the death of Elia and the likely invasion of King’s Landing by the Dornish.