On the average, a given team will win 3 superbowls a century. Its much more rewarding to be pleasantly surprised by a Superbowl win (i.e. 1981, 1988 49ers) than the be disappointed by a failure to win one with a potential SB winning roster (i.e. for the 49ers: 1983, 1985, 1987, 1990, 1992...