Its far more likely that Ethiopia will remain intact, than it will be for its Somali territory to break-off and join Somalia.
Its the 2017 not 1977 or even 1700. The world changes, nothing is static.The British, French, and Germans have a far longer history of emnity with each other but would anyone seriously suggest that the solution would be to rekindle those battles? This region was populated by Germans for centuries up till the mid 20th century, until they were mass deported by Stalin in the end of World War 2? Volga River - Wikipedia Would it be logical for Germans to declare war on Russia to unite ethnic German territory? Again if you stay using these old concepts to understand how to organize a state in the 21st century, you will go nowhere.
The Tigray project is already beginning to crack. Both oromos, Amharas and Somalis are seeking more self-determination. There are going to be some very rapid changes in the next few years.
I don't want an unstable Ethiopia next door to my country so I'm not wishing for an Ethiopian civil war. I do want the Ethiopian state to become more decentralized tho. If somali-Ethiopians are happy to stay in such a union, God bless em.