I like the idea of Voyager ending up destroying a huge crucial Borg installation but I would have done something other than 'Future Janeway'.
Like, maybe Voyager was meant to destroy the transwarp hub, and if they don't do it the Federation will be destroyed by the Borg. And Voyager ends up into some kind of Enterprise C situation where they have a chance they weren't supposed to have to get home. Then the Relativity group try to force them to go back to the DQ, and Janeway tricky as always tries to find a way to both destroy the Hub and get to stay in the AQ.
It could end with Janeway pretending to agree then somehow stealing a 29th century ship to destroy the hub.