Turns out Square-Enix still has a desire to release Dragon Quest X outside of Japan. This little tidbit was shared by producer Yuu Miyake in a Game Informer interview.
"We wanted to release it in [North America; I still want to release it]. However, with the MMO, it was based on a five-year plan of service, so if we were going to release it in North America, there's the question of how we would rearrange that."
Let's hope Square-Enix can figure out these issues and make a release happen. I'm sure tons of Dragon Quest fans would still be eager to hop in.