DC Statehood is perennial loser. It should fail again. DC has a very corrrupt political class. Its government is corrupt.
I wonder if their enthusiasm would change if walk away really took off
You are correct on all accounts.
Corruption is not the issue. We made DC a non-state for very important reasons of Federalism and it needs to stay that way. Corruption can be and should be cleaned up but it seems we have to start by cleaning up the agencies that investigate and prosecute political corruption.
If you want to make all or some of DC a state, then dissolve it and give the land back to Maryland and Virginia.