Let me use the Walking Dead as an example, in Season 3 they finally find a safe place they can build their own little colony at with walls and structure and farming land that's defensible from the Zombie Hordes. It all looks good until a nearby re-settled village run by a Sadistic Lunatic Dictator can't accept anything outside his control and war breaks out until both areas are destroyed and the characters have to move on again back to where they started before they found their new home.
From that point on it became the same repeating plot of them finding a new safe place until it's inevitably destroyed and they have to leave again. They just take the Season 3 plot and kept repeating it until the show ended after 11 seasons. So that's 8 more seasons of the repeated S3 storyline.
That's all Voyager could do, they find a place they can live at until something forces them to get back on the move. From that point on, you either repeat that same plot of "Stay somewhere, until they screw up and have to leave again" or they just find a way home and the story just ends.
They can't accomplish anything and still be on the move, not without things getting stale.