Many have stated they will vote no....Never get is the way of a pilot and a bag of money and rotating at the top sure does that!
Its a zero sum game. For every "winner", there is an equal an opposite "loser" under the current system. It's a question of distribution.
The only wrinkle to this equation if someone sees themselves as potentially becoming a winner at some point in the future.
Given there is almost zero chance of any fleet expansion on the A380/B747 in the lifetime of the universe, the considerations are their age, position on the seniority list and the age of those above them. Retirements are the only hope of movement up the list.
Those that figure they have time to become a winner will probably vote no (younger & more senior) , those don't (older junior) will likely vote yes to rotating seniority.