FujiTV, where the anime adaptation will be shown, has already expressed interest in bringing the show westward, but has stated that they are waiting to see if Stories takes off in Japan first before pursuing those plans. Capcom is likely the same way when it comes to the game itself.
It may be a while, but with this being the game that the "main" MonHun dev team has been spending so much time on, and has been getting plenty of marketing push in Japan? I think it's pretty safe to presume that they want to bring it over here, too. Even if Capcom may need Nintendo's help (again) to do it.