This is just conjecture on my part, but Hopkins will have 5 regular season conference games plus possibly 2 conference tournament games, which adds 7 games, while they already play 3 of these team, so a net 4 game addition to their schedule, meaning they need to discontinue playing 4 teams on their current schedule. They have a lot of in-state games (Towson, UMBC, MSM, Navy, Loyola) which they probably want to retain.
I believe it was stated on the ESPNU telecast of our game with Hopkins that it was the final game in the series.