I understand the proposed EBA is being contested as the EBA is looking to reduce rest periods whilst increasing shifts to12/14 hours (minimal pay increase, reduction in entitlements and many more benefits reduced).
While i was at AD a head office team member mentioned there cabin crew staff numbers are much lower than expected which is why mass recruiting is occurring (not just at Qantas) and increase in ground schools.
If the proposed EBA was to be approved it could have negative impacts on recruiting talent and retaining current staff (especially long serving cabin crew).
I think its still a while off and features in the media a bit as well as unions and aviation association so it may be worth keeping on top of in-case there is a major shake up.