You can dilute Van Hollen's seat without causing too much trouble. It's now a bit over-packed with Democrats because it was designed to oust liberal Republican Connie Morella. The old seat was like a D+10, and Van Hollen would have no problem in such a seat now.
An 8-0 map seems a bit too risky to me, even though the MD Dems would probably love to retaliate for the PA and NC GOP gerrymandering that is coming up. There's just too big a chance of 3 or 4 of them going down in a GOP wave that hits MD. You would put the white Dems in the Baltimore area under a lot of stress. I am simply arguing that they would do better to get a 7th D seat from western MD than from the Eastern Shore.
Why? The Eastern Shore is far less Republican than the Panhandle, and putting Carrol County into a Democratic-district would be a waste of Liberal Votes. You can Draw a 1st District that takes the Eastern Shore (up to Cecil County), Annapolis, and some White parts of Baltimore and wind up with a district that's about 55% Obama and shouldn't be hard for an Eastern-Shore Democrat to hold. Every other District is at least 64% Democrat aside from the 6th, which takes the Panhandle (minus Hagerstown and Frederick), Carrol County, the Northern part of Baltimore county, Hartford, and Cecil, and is 63% McCain.
The 7th takes most of Baltimore, along with some Northern and Eastern Suburbs, and is 58% Black, the 4th takes inner PGC, along with Charles, Calvert, and most of St. Mary's (Hoyer lives in the northern part of St. Mary's) and is 57% Black.