You need to stop chewing too much khat. It is clear you have no clue about the insider workings and mindset of the "xabashi" aka Ethiopians.

Now let me destroy your delusion with some facts. The idea to make EPRDF a unitary party open for all Ethiopians was entertained by none other than the late Meles Zenawi especially after EPRDF's devastating defeat in all major towns/cities in the 2005 election. And at the last EPRDF party convention held in 2018, EPRDF decided to expand its base and include the so called "satelite" parties from "junior" regions (Afar, Somali, Harari, Gambella, Beshangul & Afar). This has nothing to do with the current minor issue between ADP/OPD (they are still close partners). Since then, EPRDF has been conducting studies and holding meetings in these regions. Now it is in the final stage that EPRDF will become one big party no more confined in the 4 traditional regions (Oromia, Amhara, Tigray & South) but will expand in all of Ethiopian regions. This will give every Ethiopian equal opportunity to become a PM (if EPRDF wins elections) and to have a say in the party.
Btw, the guy heading this expansion of the party is an Amhara official from ADP party. EPRDF will get huge support in Amhara region if this expansion is executed because PM Abiy is still very popular despite some set backs due to the news of some displaced people. If EPRDF doesn't expand and become open to all Ethiopians and PM doesn't campaign in Amhara region, I can tell you ADP will be beaten badly in Amhara region by NAMA and also in Addis Ababa by Ginbot7 in the next election. But if it goes with this plan and make PM Abiy its face of the party in all regions, chances are that EPRDF could take both Amhara and Addis Ababa.
And forget about the delusion of Ethiopia disintegrating. That is not gonna happen even if the current Somali region President becomes the PM. Btw he is very popular among Amhara and Oromo and could replace PM Abiy in the near future. I am very optimistic that Cagjar could replace PM Abiy. He is very popular.