On July 26, 2014 — The Hall of Fame announces a change in voting rules, as players will now be able to stay on the BBWAA ballot for a maximum of 10 and not 15 years, as long as they meet the minimum 5% threshold. The move is designed to prevent the ballot from becoming overly crowded because of players tainted by steroids staying on the ballot for years on end with no realistic chance of election, but drawing votes away from more legitimate candidates. However, a number of inductees with an untainted record have had to wait over 10 years for election in recent years, such as Jim Rice, Bert Blyleven or Andre Dawson, making it likely that the rule change will have the effect of also squeezing out some worthy candidates.

Source:
Baseball Reference July 26