Square Enix has no interest in building the audience for DQ on Xbox, as the entire purpose of that would be to increase sales of the mainline RPGs, and those will never come to Xbox. DQB would probably do better than other DQ options, sure, but that might mean 10k sales which isn't worth it, especially when the Xbox version will NOT sell in Japan.
Why should I care if the game will "NOT sell" in Japan? There are tons of other countries to still sell the game in. This "will not sell" nonsense is coming exclusively from Japanese devs/publishers. Especially from Square Enix, where we get these type of statements:
Nomura said:Do the Western audiences want Kingdom Hearts titles on the Microsoft or Xbox platforms? Japan might say well, we dont want any more on Xbox.
The statement is especially dumb, because the games literally were released a few months ago and Xbox One versions were probably not even considered.
You won't see devs/publishers in other countries making statements like that. other countries actually try to grow their audience, instead of just actively ignoring them.