At the end of "Q Who?", Guinan tells Picard that Q's actions led to a premature contact between the Federation and the Borg. The scene is largely in line with everything we know about the Borg and their history, but she does say one thing that seems remarkable:
"Now, perhaps when you're ready, it might be possible to establish a relationship with them."
Dude, wait what?! Since when does any race, regardless of technological level or advance warning, establish any relationship with the Borg other than open war or mutual ignorance? Q can afford to ignore them, and Species 8472 knocked them around, but that seems like pretty much the extent of what the Borg are diplomatically capable of.
We know they can make temporary alliances of convenience during times of crisis, but has any race, ever, been shown to establish a trade, research, or diplomatic relationship with the Borg in a stable, ongoing way, as Guinan seems to be implying is eventually possible for the Federation?
Or is this Guinan's way of saying "anything's possible"?