I don't think these guys calling for a rebuild understand what a rebuild entails - totally tearing the team apart and (gasp), running the kids out there, just the kids. Minnesota is not the Yankees, Dodgers, Mets, Red Sox, etc... that buy their way into (and out of) contention, the farm system needs to produce.
That being said, the Twins have a nice mix of pre-arb, arb eligible, and veteran players and are trying to find the right mix to win the AL Central.
The farm system is also producing some talented palyers. Some of these players never live up to their prospect status, some do and some over perform, it is on the manager and coaching staff to use the right combination win. Unfortunately, injuries do rear their ugly head and players get de-railed along the way, it's part of the game. It then becomes a game of next man up, which this team does not always seemed prepared for, whether it's the player's fault or the manager's, IDK.