I'd guess BASSA will still have a majority of yes votes amongst those who vote at all, but that the overall vote will be down again, and I would also guess that as the total number of yes votes go down, so the % of those voting to strike who actually would be prepared to strike will go up - as they are the diehards among BASSA.
Whether the union would call a strike if the yes vote is low compared to total union membership, as opposed to those who bother to vote, I rather doubt.
It would seem unfair of the union to ask their loyal members to lose their staff travel, possibly for good this time, and earnings, in a futile gesture, and it seems very likely any strike would be just that.