I'm a Skins and O's fan, so I have the best/worst of both worlds (but I root for the purple and black if they're not playing the Skins). Speaking for myself, I've always said that my love of the Orioles is much greater than my hatred of Peter Angelos. As ridiculous as this might sound, I think that the fans should give them a chance to see this rebuilding process through. I don't like Angelos, but I will give him credit for keeping the team in Baltimore when there was talk about them moving (when he first bought the team), and for bringing in Andy MacPhail. If you notice, we haven't really heard much from Angelos since MacPhail's arrival, and that's how it's supposed to be. Angelos brought in an extremely qualified GM, and has since somewhat stepped away. Unfortunately, Daniel Snyder hasn't learned that yet, and I have to wonder if he ever will. I think that he's a bit more dedicated to winning than Angelos, but Angelos also seems to be trying to correct the mistakes of the past by doing things the right way now. Nevertheless, both of them could take cues from Steve Bisciotti and Ted Leonsis on how to own a professional sports franchise. (I'd love to see Bisciotti buy the O's one day if Angelos was ever selling and he could afford it.)
As for the Browns' fans, I'd recommend that they be careful. While I'm a Redskin fan (and I live in Northern VA), I was always extremely proud at how Baltimore embraced the Ravens. Whether the team was in contention or not, that stadium is usually packed, as the fans remember what it was like having no football. The Colts didn't leave due to lack of fan support per se, but Irsay was a worthless hack of an owner that not only had no loyalty to the city, but in fact he despised Baltimore. From day one, he fought with the city council and William Donald Schaefer on the stadium issue, all while slowly gutting the team. When fan support dwindled and he didn't get a stadium, he moved. (Obviously, fan support dwindled because the team was poor due to him gutting it.) My point is that Baltimore lost a team once, and as a result the fans appear to be committed to never having that happen again. Cleveland also lost a team, and I might add a team with equally as much history as the Colts. Those fans should be careful in their protesting, because if it can happen once it can happen again. In theory no team is safe from moving, but if you protest with your wallet too much, the owner will eventually get the message for sure...and the option of moving the team to a place where he can get more of a profit will suddenly be on the table. Ultimately one would hope that the owner would try to make changes (as Angelos did) to put a winning team on the field before moving, but ultimately sports is a business, and there's no getting by that. The Washington Capitals were bad for years, but now they have solid ownership and a championship caliber team, and the place is sold out. Assuming that Angelos continues to stay out of things as he's been doing, that'll be Camden Yards again one day.