We have the same question, in the same area, though we are looking out about 2-3 years. There is a pretty strong military/Pentagon and diplomat rental market if you are inside the beltway or maybe just barely outside the beltway but close to metro. If you are that close in, then my opinion (and it's only that) is that the mozar's comment is true only if you are farther out or perhaps in a lesser school district. Keep in mind that after the 2016 presidential election there will be change of administration which usually gives the close-in residential real estate market a boost as appointees and trickle-down employees of the new administration move into town. Based on what I've seen with every administration change since 1990, this will be a substantial, if brief, bump in demand--particularly in the spring of 2017 as folks with kids in school will be vying for houses close to DC that have good schools. It might be worth renting it until then, but you also have to consider the likelihood that interest rates may go up which will have a countering downward effect on prices.
Anyway, I'm curious as to other thoughts on this as part of my own information gathering.