It could be possible for Eris to serve the last proto-Hive, Taox, to have revenge on her corrupted species for destroying the proto-Hive and her allies, and maybe, [i]just maybe,[/i] Taox will enlist the Guardians to aid her conquest of revenge against the Hive.
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Based on what we know of the proto-hive's lifespan, even as a mother, the only way Taox could still be alive is if she were in stasis, in which case she could not be influencing anyone in the present day. I personally think that at some point we're going to encounter her, as so far no loose thread in this game has refrained from becoming significant.