There's certainly a sense of urgency for the Cubs this winter, but they won't make moves just for the sake of shaking things up.
The Cubs always anticipated a window of contention for at least seven years and we're now on the backside of that estimate, with only three years until a bunch of core players like Kris Bryant, Anthony Rizzo and Javy Baez all become free agents.
That doesn't necessarily mean the championship window is closing (a lot can happen in three years) but it does mean there is a strong desire from Theo Epstein's front office to try to capitalize and win another ring, especially after the 2018 season ended with only one playoff game.