I won't put a specific time frame on it, but I think it's not fair to expect immediate results.
The biggest thing going forward has to be getting the right personnel in here to run the scheme. That won't be a problem however, since Ted himself played in the 3-4 and our Director of Player Personnel Reggie McKenzie played under Dom Capers back in college (also the 3-4).
It'll take a year just to get the players familiar with the scheme, plays, concepts, etc. and I think in year 2 you'll see the players start to grow in the scheme.
I think it's fair to expect the Packers D to show its true colours in 3 years, after they've had a chance to get comfortable and the 3-4 scheme has been developed to suit the players on the roster. So three years would mean the 2011 season.
The NFL: Where Greg Jennings Happens.