The answer to this question is always yes, during every off-season. One of the folks over at the STRIB points out that six of the players who were in the starting lineup for the playoffs in 2010 are gone two years later. But that 2010 playoff lineup had only 5 players from the 2009 lineup. In other words 4 players were gone the next season, not two years later. And Justin Morneau wasn't in either of those playoff lineups.
One reason the Twins have avoided, until last year, big losing seasons is that they do rebuild each off-season, replacing aging players who were likely to get worse with younger ones who are likely to get better. Letting guys like Guerrier, Rauch and Hardy go after last season made sense as part of that strategy.
What is disturbing about this off-season is that is not really what is happening. Instead the Twins are signing aging players to fill gaps. That was the pattern of the late 1990's, a period of futility. When you see the Twins signing old guys like Willingham and Carroll and letting young players like Slowey, Mijares and even Kubel leave, you wonder if those moves really make sense for the future of the team.