They could have been honest at this year's convention like saying
'Dear brothers, we as an organisation have decided to make some important adjustments.
admittedly, we got the year 1975 wrong. We printed this idea through a our literature which in turn built up false hopes. We on behalf of the GB wish to apologise for this error.
Also just to set the record straight our understanding is that Jerusalem was actually destroyed in 587bce. But this doesn't change God's timing about the end of the 'age'.
What's more, we would like to suggest that our teaching on blood, and the celebration of birthdays is now up to an individuals conscience and no one should judge his brother over their choices in such matters.
If an individual chooses to leave the organisation freely. So be it. As a change in our policy individuals making such a decision should not be shunned. But out of Christian love, the door is always open to welcome such ones back.
We have also made a thorough review of all our policies and would like to announce that are policies are available to read on our website JW.org. We also welcome any constructive feedback.
We hope these changes reflect a Christ like spirit of love brothers. We thank our God Jehovah and our Lord Jesus Christ for helping us in bringing about these momentous changes.