I think Amhara nationalism is one of the few things that could break Ethiopia fairly quickly. They'd need to stop the cope of trying to govern the whole country, but the absolute natural conclusion of Amhara nationalism is the reverting of Menelik's conquests and retreating towards a homogeneous Orthodox nation-state in Abyssinia.
I think they'll eventually make common cause with Tigray/Somali/Afar separatists. Think how Russian elite in the USSR were pro breaking up the union as they saw it as a drain on resources, Amhara's have far more reason to want to break up Ethiopia than Russians did, I think they'll come to this conclusion soon.
Ironically it will probably be Oromos trying to hold Ethiopia together long term
I think they'll eventually make common cause with Tigray/Somali/Afar separatists. Think how Russian elite in the USSR were pro breaking up the union as they saw it as a drain on resources, Amhara's have far more reason to want to break up Ethiopia than Russians did, I think they'll come to this conclusion soon.
Ironically it will probably be Oromos trying to hold Ethiopia together long term