Alamo Drafthouse isn't done with the D.C. market. The franchisee in charge of the restaurant's Ashburn location. Anthony Coco, says in My Statesman they're on the hunt for location #2, though he doesn't offer any intel on exactly where:
I moved my family across the country to open our first Alamo two and a half years ago. We are aggressively looking for a second site. It wasn’t easy leaving family and friends, but it’s been an absolute blessing. D.C. is a great town and you’d have to drag me back to Texas.
Alamo first opened in the area at the One Loudoun development back in May. At the time, a company spokesperson said they'd like to operate up to five locations here.