Representation is not effective nor complete if it is not in both chambers. For example, only the Senate votes on treaties and presidential nominees. Only the House of Representatives has the power to initiate spending bills. Conference committees, reflecting differing views of each chamber, are pivotal to the final outcome of legislation. Any reapportionment for the House of Representatives would follow traditional requirements and accord with results of the census.
Proximity has no practical consequence in and of itself.
In fact, the U.S. Capitol is located geographically closer to some parts of Maryland than it is to some District neighborhoods. Access and influence in Congress is not dependent purely on where one lives, especially given the realities of current day communications and technology. To those born in the District, such a suggestion is an affront to their birthright. Others may not be able to afford to move even if they should so desire. No citizens elsewhere in the country have to move to vote.