So if we're saying it's obvious, it has to be
Spoiler!
Jack realizes who his real family is and red-eyes the borg out of existence? Kind of disappointed if that's the ending. I would have preferred Picard vs Locutus and Jack doing something badass to take out Locutus.
Because fighting the entire Borg and a Borgified federation super-fleet seems an impossible task that has to be solved by Deus Ex Machina/Hand-wavey Star Trek technobabble
Oh well, in Matalas we trust. I'm fairly certain Seven and Raffi are going to get in Voyager next.