Likewise, the advent of PITCHf/x as a tool for critiquing umpires may have bred a new hitting approach among hitters who once played more aggressively given the uncertainty of the ball-strike call. Coinciding with the fly-ball hitters’ revolution: the rapid decline in sinker usage. It was just a few short years ago the Cardinals seemed to have found that teaching mid-level starters a sinker or two-seam grip could turn them into All-Stars. Now, the groundball revolution that helped pitchers may have turned into the flyball revolution that increased major league power again and killed the seeing-eye single.
Due to the infrequent addition of members into the 50 home run club, Baseball Digest called it "a restrictive fraternity comprising slugging elite"  in 1954, when there were only six members. Of the seventeen members eligible for the Baseball Hall of Fame , eight have been elected and three were elected on the first ballot. Eligibility requires that a player has "been retired five seasons" or deceased for at least six months,  disqualifying four active players and five players who have been retired for less than five seasons. Some believe the milestone has become less important with the large number of new members;   fifteen players joined the club on a total of 24 occasions from 1995 to 2010.  Additionally, several of these recent members have had ties to performance-enhancing drugs .