It might take longer. The SNNP central committee has not completed its meeting. Maybe drugging foot and buying time to do some house cleaning is being done. The Americans find this very frastrating, but cannot say openly to hell with rules, go and put a prime minister we agree with. lol
Then comes consultation with allies like Somali, Afar, Benshangul, Hareri etc.
Regardless of who it is, there will not be an effective one, since the Oromo and Amhara cannot maintain peace and order in their regions. They both are caught between diaspora and internally different regions, tribes.