It seems that way. I think they're also dropping NBC Sports Washington and NBC Sports for Oakland bay area.
I'm running out of options to watch the O's. AT&T TV looks to be the cheapest, and it's not exactly cheap. Amazingly, adding AT&T TV is cheaper than bundling Fios TV with the internet I already have. I'd gladly hand MASN $15-20/mo on its own if I could not pay for all the other junk I don't need.