And maybe a change to DC's height limits would result in rapid growth within the District.
DC is guaranteed to get EV #4 last. No matter its population, it can only get a fourth EV if every other State has 4. So if 2 million Manhattanites had decamped for Washington, DC in the noughts, it would still have just 3 EV.
A number of electors of President and Vice President equal to the whole number of Senators and Representatives in Congress to which the District would be entitled if it were a State, but in no event more than the least populous State; they shall be in addition to those appointed by the States