I dont know where I read it somewhere. But I think it was on Reddit.
The Borg could be doing a callous purge of the older ones before a "massive sellout" or something..
Should there be a rebellion of the victims($heeples) the Borg can do a massive sell-off of all the KHs & assembly halls & go directly on line.
It could very well be in place. The groundwork is there.