I haven't seen this as an issue yet. Have they already picked a rep if this goes through?
I imagine it would still be Norton. Not that it's relevant, as it will never happen.
There is simply
no way whatsoever that this can be Constitutional. Here's hoping the Supreme Court honors this simple fact.
I can say that I doubt that when D.C. was established it was predicted that it would become more populous than some states (well, one for now). I think at some point
something will need to be done regarding this, because having a half a million people paying federal taxes with no representation in Congress is probably
more reprehensible to me than completely ignoring the text of the Constitution.
Still, this is not the way. Amend, or figure something else out, but this is no good at all.
A better solution would probably be to give D.C. residents voting rights in Maryland or Virginia (probably Maryland). Let them vote in federal elections through a proxy state, leave the rest as-is.
Of course, this kinda screws them in the Electoral College, but absent an amendment it seems like the best solution that actually recognizes the existence of the Constitution.
EDIT: Then again, this would probably require the consent of Maryland. Which is unlikely.