Since I have to tussle with the IOD twice daily, what’s being proposed ought to help a fair bit I think. While it isn’t full on “avoid mixing at all” options (bridge, tunnel etc.), they seem achievable even with the jurisdiction issues. I’ll take that over nothing.
Having more room for staging the crossing, better visibility of the trail traffic from Roosevelt, and the shorter distance to cross sounds pretty great. Plus I’m all for mitigating the Custis squeezing that happens as you get closer to Rosslyn. There tends to be a lot of ped traffic at that point that we have to pass at speed and not having to avoid a power box when passing would be nice.