In my opinion Bandai prioritizes the domestic market more than anything else when deciding what gunpla to release next.
Granted, they won't ignore such a big market as the USA but if it had the capacity of meaningfully changing what releases and with how popular Wing is there I don't think the HG Leo would have taken so long to be released or the MG Nataku would not be P-Bandai.
This can obviously change now that gunpla is officially released in the States as long as the weight of its sales grows more important.
Granted, they won't ignore such a big market as the USA but if it had the capacity of meaningfully changing what releases and with how popular Wing is there I don't think the HG Leo would have taken so long to be released or the MG Nataku would not be P-Bandai.
This can obviously change now that gunpla is officially released in the States as long as the weight of its sales grows more important.