Where the game is played is irrelevant to TV other than time zone. UConn isn't moving any league games to MSG. St. Johns has no particular appeal to most people outside of Queens, and not many in Queens.
Half this fanbase seems to live in a bubble. I Googled St. John's Attendance to see what they did at MSG and the first several results are from various high schools. That says it all about St. John's. St. John's averaged 5,588 per game over 18 home games. I can't find the attendance for the MSG game vs Nova or the game at Barclays.