It wasn't Syliva that ended the series - it was Geno, with a nudge from ESPN. Geno wanted more competitive games.
From the Register:
Even after being on the receiving end of the worst loss in program history, North Carolina coach Sylvia Hatchell said she likes to play UConn and would like to continue the series. However, even before the 51-point beat down, the word I was hearing that ESPN had tired of airing the UConn/North Carolina games only to see the game decided by the second television timeout.