Not quite. When the last strikes were carried out, approximately 7,500 crew voted to strike. Willie Walsh told City investors (so these numbers have to be accurate) that approximately 4,900 crew went on strike and of those 600 returned to work during the strikes.
So only 65% of Yes votes actually acted in accordance with their voting pattern.
Add to the fact that this time strikers will know that the removal of staff travel is no empty threat and how much basic pay they will lose and how futile the strikes have been, I'd estimate that support for an actual strike will be considerably lower.