The conflict between Amaras, Tegarus and Oromos is so deep that, they can never come together and live reconciled. A lot of moderates in the trio tried to forge unity based on equality. It never worked.
The only way of life is based on power balance. Till 1991 As have got power and suppressed both Ts and Os to death, so the latter two cooperated to fight agains As. Now Ts have got power and the other two (As & Os) try to unite to get rid of them.
But As and Os can never unite for they mistrust each other so deeply!! Amharas have a fear that when Os come to power, they will liberate their Oromia and there will be no more IMIYE Eth. So they vehmently oppose that. They even support Ts to stay on power than Os over take it. That is why some supported the war and took part in YE KONDOM FINDEEQAA after getting "victory" on Somalis.
Oromos on the contrary will never allow As to come again to power for they fear that As will dismantle the Oromo regional area, Oromia. They also prefer that Ts stay on power than As come again.
Tegarus will rule and loot forever, if not they will declare Republic of Tigrai. They fear both As and Os, if they overtake power that they will revenge for the atrocities Weyane did on them.
So the only way forward for Oromos is just fight till Oromia will be free for the probability of forging a genuinely autonomous Oromia in a genuinly democratic Ethiopia is almost impossible due to such mentality of Abyssinians.