yup, Ayumu Kase also also went over there last year and did videos for quite a few companies before fading, but Marica has been the only successful one, and that's because she does everything. Hitomi is probably the only one that could make a successful transition because she already built a large following in the us, but I doubt she'd risk her comfy income for the risk of america
Marica Hase is suitable for american porn audience, while many other JAV idols are not
and the second main reason is income, moving to america doesn't guarantee they will get better life there