The vote that is to take place is arguably the most important vote that cc have ever participated in.
Indeed it is. However, cabin crew previously had the chance to vote on an offer that is barely any different to this offer and not even 50% of them bothered to vote. That may have been in part because of the relatively short two week ballot period. However, that is still a low turn out.
With staff travel having been restored, and four months passing since the end of the strikes with absolutely nothing achieved by Unite, things may have changed now. But the greatest danger is this offer being rejected because the militant minority all go out and vote no, and the moderate/disinterested majority simply don't bother either way.