Do the Dems have any incentive at all to not do an 8-0 gerrymander? I assume they have a veto proof majority on the state level.
They do. Anything less than 7-1 is obviously a nonstarter. I think the reason that the current map isn't 8-0 is annoying incumbents with annoying requests (e.g. one wanted to be in the DC, Baltimore, and Annapolis media markets to boost a potential future statewide run) but my money is on 8-0 after redistricting.I think that was largely moot in the current map in terms of MD-03. Unless he's planning a gubernatorial run, John Sarbanes is probably a lifer in the House. MD-02 has its shape because Dutch Ruppersberger wants multiple military bases in his district that don't naturally fit together. In the last redistricting, Donna Edwards didn't get the district she would have liked. She was low in seniority, something that is now true of most of the MD delegation. Hoyer will get whatever he wants for as long as he wants to remain in Congress (the same is true of Ruppersberger).
I do think MD Dems will go for 8-0. Most maps have MD-01 crossing the Chesapeake, but Baltimore is another option. There are a number of parochial interests in Maryland, but some will be ignored for the greater good. Maryland is rock-solid Democratic and trending even moreso. They can push their luck, especially considering Biden won the state by 33%.