Replacing the main actor in any movie is bad for the franchise, my example is triple X(xXx), which lost it's edge when replacing Vin due to his Riddick shoot. however if the focus is the idea of a daughter(X23) of his to take the main role would be ideal due and u can make wolverine a co-star which will definitely soften the blow in replacing Hugh as Wolverine. not to mention arouse the audience of sexy bad ass action scenes. but you need a good actor n Stunt devils.
you have to beat that. no old school mortal kombat type stuff.