DC cannot become a state. If so, then the Federal Government would be under the jurisdiction of a lesser (state) government.
I don’t think there is any way to fix the Constitution to allow for that.
Well that was the original logic for not making it a state. But that’s different from saying it CANNOT be a state. It can if the law says so. Lots of countries have capital cities that are parts of particular provinces. The Dems want it to be a State and will make it a State on their terms if they have a chance. My proposal would make them think “Be careful what you wish for.”