Not happening because that would make the movie good also the only thing they care about is money and that comes spending it on big names that might know but more likely just learn to fight on the fly, also main actors make millions for some reason while that money should be more evenly distributed to writers, vfx artists, clothing designers, scenery makers and so on resulting in a better higher quality product but in reality Ms silicone butt makes 10 million dollars because acting talent(cough pretty face) is 100x more valuable than the same amount of time, expertise, effort in any other equally as important area of work in making a movie which otherwise would just look like a turd with a nice looking person in it.