KnowledgeReignsSupreme said:
No one said the transition would be easy.
Exactly. I don't have any reason to assume that the 'Skins could have traded Carter for something that would have improved the team, but chose not to. Carter is talented, and has been given a chance to use that talent to help the team in a 3-4. There happens to be another player on the team that appears like they can better fill the role that Carter has been tasked with.

Everyone keeps complaining about forcing square pegs in to round holes, as if it would be any different if the coaches decided to keep a 4-3 while acquiring 3-4 players now to make the switch later. This team is going to be a 3-4 defense team. Keomotu and Carriker were acquired because they fit a 3-4 scheme. I don't think Keamotu would be a good 4-3 DT, and Carriker has struggled playing DE and DT in a 4-3 in the past. So if they had decided to stay in a 4-3 until they had all the players they needed for a 3-4, you'd hear the complaints about players being miscast for what they're asked to do. Or having wasted talent on the roster that can't play the positions they would be asked to play.
Either way you'll have some players that don't ideally fit the defensive scheme that's being played. At least the way they are doing it now, the scheme is in place. Give the team a reasonable amount of time to acquire the personnel needed (one offseason is not a reasonable amount of time).