In the "original" timeline, the borg were removed by the caeliar during a devastating attack on alpha and beta quadrant. (Start trek: destiny trilogy). After that, the next enemy was the typhon pact. It consists of the Romulan Star Empire, Tzenkethi Coalition, Breen Confederacy, Gorn Hegemony, Tholian Assembly and the Holy Order of the Kinshaya. After getting knowledge about the pact, the khitomer accord was expanded with Ferengi Alliance, Talarian Republic and Cardassian Union.
Tbh, i was hoping, when i heard first of STO, that they will use that configuration.