TNG already finished the Borg as an enemy anyways with BOBW. There was no way for VOY to top that story since no one would give a damn about the inhabitants of the DQ in comparison to Earth, and all of TNG's post-BOBW stories about the Borg weren't that good either.
The problem was that TNG left it too open-ended after BOBW, when it should've been made more clear what their intentions were. Either make it clear they're going to keep coming back, or contrive some explanation for why they wouldn't.