Lynx - you don't think it defangs the Borg a bit if the serious, implacable enemy is entirely unable to kill any important character? Doesn't that seem a little absurd?
Maybe, but why Janeway and why now? Why not Picard in "Best Of Both Worlds" or the whole Voyager crew in that episode where some of them were assimilated?
As for the Borg, they were already "defanged" when Hugh and the Borg Queen entered the scene in TNG and they have lost everything since then. I would be happy if they were ditched for good and a new enemy was brought in.