I haven't had time to read the whole thing, but it's interesting. That's a City of Alexandria plan, so they couldn't control anything to the south, but the Beltway acts as a wall there anyway. The best those of us living south of that area could hope for is an improved Van Dorn/Eisenhower intersection and better light timing. (My current commute is on the Metro most days, but we drive to Springfield or Huntington, never Van Dorn.)
The Farrington Connector would be interesting depending on what they connect it to. Right now if you followed that route, you'd either go right on Pickett back to Van Dorn or you could cut through the Smoot Lumber car park to Edsall Road at the light outside Overlook (a lot of people use that route now between Pickett and Edsall to cut off several lights). I think I see the bridge on the other side, which looks to be planned for near where the new fire station is, as being more of a relief route simply because so many people turn off Van Dorn at Pickett to head east to Duke Street.
It'll be interesting to see what comes of all this. The timing is probably right. I believe the TSA plans to move its headquarters to that large vacant office building on the north side of Eisenhower (I think it's Victory Center?). If/when that happens, other commercial development, such as restaurants, will be needed to support the HQ. It'll also be interesting to see how this proposal competes with the plans, currently still in the rezoning process, to finish and redevelop the Kingstowne Town Center and Shopping Center, as well as the plans for more office space and the like around Springfield Mall. That'd be three of those sorts of things in close proximity.
I do note that morning traffic on Van Dorn has been lighter this fall than in past years. Fairfax County Public Schools changed the bell schedules this fall, with the high schools starting 40 to 50 minutes later than in the past (Edison used to start at 7:20 and now starts at either 8:00 or 8:10), and I'm sure that's helped. Obviously it's not the sole factor, but I'm sure it's contributed. Some parents don't like to leave for work until their kids leave for school.
BTW, regarding street layout, the big failure in this immediate vicinity is the lack of ways across the Beltway and the train tracks. Setting aside I-395, you have Van Dorn, Telegraph, Route 1, and the GW Parkway/Washington Street. That's it on this side of I-395, and due to the distance involved, Van Dorn bears a hefty load. Clermont Drive used to connect up to where Eisenhower is today via what is now the Eisenhower Connector, and it was planned to go up to Duke Street at the interchange just west of where Harris Teeter is now. Certainly Clermont south of the Beltway is not suitable for use as an arterial street. It'd be utterly inappropriate. BUT if it were connected to the light at the Eisenhower Connector interchange, it would become an important route, especially if that "multimodal bridge" connecting Eisenhower to Edsall at the BMW dealer were to be built. Oh well, doesn't matter, Clermont will never be reconnected.