Seeing as how Captain uniforms aren't skin tight and Starfleet has discontinued the skant, then Seven couldn't be made Captain.
Chakotay would be "promoted" to command the ship but Seven would remain in the lead role with the Doctor as her sidekick. All other characters would be relegated to guest appearances on every third episode, as Voyager
waged a successful war against the Borg Collective, each week using new and previously unknown tricks and abilities Seven possesses.
Commander Austin Harris, First Officer, Deep Space Nine (by FltCpt. Bossco)
8.01 - Darkest Before Dawn
(Chapter 8 added, 12/09/2015)