Why would the big holders want to attack one of the chains?  Their holdings are in both chains, and they can keep, move and sell them independently.   Whatever value each branch of the coin has, attacking one branch will kill its value -- which will hurt the holders more than anyone else -- but is unlikely to raise the value of the other branch by the same amount.  

The holders should *pray* for a proposed hard fork will EITHER fail quickly to gather any support, OR quickly achieve majority support and end with a clean non-eventful hard fork.  Any fork attempt that does not resolve cleanly in one of these two ways can only harm the value of their holdings.