According to a report at Kotaku, Dragon Quest X may indeed be brought to the West but perhaps not in the same form in which it lives in Japan. Producers Yosuke Saito and Yu Miyake said that games can vary from country to country to fit the needs of a diverse world audience.
Saitou: This is just my take on it, but it appears that different countries play games at different speeds, and the community management is also diverse. It's more than just if players would be able to enjoy universal seasonal events, so I believe we should manage countries and areas separately. That's why I think we should have separate servers for each country.
Read the full article at Kotaku.