I use to cover the Fredrick and Gaithersburg area and a lot of people were moving over to WV for the lower taxes/cheaper housing before I retired. It is only about a 45-60 minute drive from WV to the those areas. I have spent more than 45-60 minutes on the Capital Beltway trying to drive 10 miles. You haven't lived until you have experience the Mixing Bowl. There are a ton of high paying jobs and government workers who work outside the Beltway and never go into DC.
I think the eastern panhandle area will continue to grow as people look for for more affordable housing and lower income taxes. Housing/real estate taxes are a big motivation factor for the moving to WV. Maryland and and NOVA has some expensive property and high taxes. Leesburg, VA has grown over the years due to the lower costs, but is becoming over populated and expensive. JMO.