DC statehood opponents, what is the real reason for your opposition?

[Frodo]

I have always opposed DC statehood.  I know I have a reputation for being a partisan (and I make no apologies for it, especially in this day and age...), but I have always preferred that if the status quo becomes unbearable, DC should be retroceded back to Maryland even if that means we don't get two extra Democratic senators out of the bargain.  Cities should not become states.