I think what Notre Dame is finding, in Hockey East, is that this East Coast move doesn't bring them the same breadth of markets that the ACC or the Old Big East or Old New Big East had and so "East Coast access" is not as bountiful.
To wit, 6 of the 11 other HEA teams are sandwiched in the Boston media market (BC, BU, UNH, UML, Northeastern and Merrimack), and the only other potential needle-movers are Hartford-New Haven and Providence. Burlington, Springfield and Bangor aren't much to speak of. No access to NY, Philly or DC. Of course, you won't find home teams in those markets in hockey anyway.
By contrast: Boston, Providence, Hartford-New Haven, New York, Syracuse, Philadelphia, DC, Pittsburgh, Miami in the OBE; subtract Boston and Miami but add Cincy, Louisville, Chicago, Milwaukee, and Tampa for the ONBE; the ACC gives Boston, Syracuse, some New York, Pittsburgh, DC, Louisville, Raleigh-Durham, Atlanta, Miami, and presence in Charlotte, Richmond, Norfolk, Orlando and Tampa.