1. Jetblue has been at IAD for quite some time now.
2. UA is beefing up its international services.
3. The newest concourse area (B) is very contemporary and pleasant - and a new underground moving-sidewalk connection from Main to B will be opening very soon.
4. The unpleasant concourses (C/D) are officially "temporary". Permanent replacements for C/D (similar to B) will be built in coming years.
4. Subway system is being built now to largely replace "moon buggies".
5. Two parking garages (8,000+ spaces) opened since 2002. Fourth runway in the planning stage now. See more development plans at
http://mwaa.com/d2/index.htm
I think IAD will be around for a very long time....
By the way, the airport access road opened at the same time as the airport - in 1962.