Exactly!!! As Port Covington, Harbor East/Point, Canton, Towson, Columbia, and hopefully the rest of the city (specifically southeast and southwest) continues to become denser, they'll have no choice but to add transit.There's definitely no denying that. On the flip side, with the majority of commuters being car goers, as these satellite business districts become more dispersed then vehicle traffic will be alleviated from the core as well. Hopefully to the point where the city as a whole continues to become even more dense and there will be no denying the fact that the metropolitan area can support and will be in need of more mass transit. I know to most of us this sounds counterintuitive, and in a perfect world infrastructure would be put in place simultaneously with these developments or perhaps TOD would be approached more diligently. But as you are probably also aware, it's the density that dictates a lot of these projects and not so much a build a rail line and they will come way of life.
Consider this, if these projects in Southwest Baltimore succeed in turning the area around and it becomes similar to Southeast Baltimore, there will be no denying an East-West line as being necessary.