So says Ted Leonsis, owner of the Washington Capitals and Wizards, who predicts in a blog post that Baltimore will be the northern edge of a D.C. supercity. Leonsis writes: "By 2050 - DC will be like London, it will take up about 100 miles end to end, we will think of it as a area that goes from Middleburg to well north of Baltimore on 95."
A big reason for Leonsis' prediction is BWI/Marshall Airport. BWI in fiscal 2015 had 22.8 million passengers, more than either of D.C.'s airports.
"The three airport system is bedrock to this developing super set system here locally," Leonsis writes.