If so, then we could very well end up with a brand-new ANC single member district of its own. (Each SMD is supposed to represent approximately 2000 residents. Go here to read up.) The new McMillan SMD would not be created until after the next decennial census, however.
And would the new McMillan SMD remain in ANC 5E?
I would hope so.
The map of the ANC 5E single member district boundaries is below for your reference.
Okay, you can all roll over and go back to sleep now.