I worked out there in 1979/80, when it was just beginning the huge build up that now completely encompasses the area.
When I first moved to the DC area in the fall of 1968, they'd just begun construction on the Metro. There were many letters to the editor in the Washington Post, and a general consensus that this was a stupid project, that it would cost too much money and no one would ride it. The years of construction weren't fun. And the Metro station at DCA (National Airport and no, I will never call it anything else) was relocated in the hopes of having it completed by the Bicentennial.
I moved away in 1981. Nearly twenty years after that I was back on a visit, and in downtown DC, by which I mean at around 16th and K streets, during afternoon rush hour, I looked around and there were noticeably fewer cars than there had been forty years earlier. The Metro worked.
A few years ago after various changes in my life, I gave serious thought to moving b back to that area, in no small part because of the good public transportation. I decided to move elsewhere instead, to Santa Fe, NM, and one thing I do not like about living here is the lack of good public transportation. Whenever I move again, and it will happen, I'll go somewhere with busses and light rail and maybe a subway.
So hang in there, all of you who want to take the Silver line to Tysons. It will happen. And it will be worth the wait.