OBP was recently voted in to replace batting average as an offensive category. This vote will determine when the change will be made.
Option 1 is that OBP replace batting average from the start of next season (2015).
Option 2 is that OBP replace batting average later than 2015.
If Option 2 is successful a further vote will be held to offer 2016 or later. If 'later' wins that vote then a further vote offering 2017 or later will be offered, and the pattern will continue until a start year wins a majority of the electorate. NB: This vote requires a turnout majority, not an overall league membership majority.
Voting will close at 12noon ET on Wednesday 25th June.