MLB has not seen a huge spike in 500 HR club members recently. Through 1960 there were 4 members, Ruth, Foxx, Ott and Williams. From September 1965 to September 1971 there were 7 members added to the club over that 6 year span. I guess Mays, Mantle, Mathews, Aaron, Banks, Killebrew and Robinson were all heavily juicing. Then over the next 40 seasons from 72-01 there were 6 additions to the club; McCovey, Jackson, Schmidt, Murray, McGwire and Bonds. And finally over the past 13 seasons we have seen 8 new additions, just 1 more than the PED raging late 60s in more than twice the time, and in a league with 33% more players. Maybe we are just seeing the natural balancing of powers and we are in for another 6 new members over a 40 years period.