Yeah, I don't really buy the Maryland is for Ravens' stuff at least not in any real, permanent way.
The reason? Ask anyone around me where they're from and they'll answer Washington. No one says Baltimore. So, most people in Montgomery County, PG, etc. have attached their identity to D.C. That means Washington is their home team. Further, if you look at the cities, it's mostly been a one-way rivalry. Baltimorians dislike DC, but DC doesn't really have anything against Baltimore. I think it's a big brother little brother kind of thing so fans of the Ravens won't feel like they're betraying their team if they root for Washington. It helps that they're in different conferences. Maybe a better example, I root harder for the Nats, but I like the Orioles, too. Part of that is that for a good chunk of my life DC didn't have a team and the closest one was Baltimore so I adopted them until we got ourselves a team. Then, when our team was doing better and theirs was doing lousy almost all my interest tilted towards the Nats. Likewise, for most of this younger generations lives they didn't have a football team (worth supporting). Stuff like that reverses fast.