To me, it seemed like the natural way to go. As weird as the whole racial politics were, that doesn't change the fact that most people know Psylocke as a sexy Japanese ninja, and keeping that intact was wise for pleasing audiences and marketing. Also, let's not forget, if you want Betsy, you got her as Captain Britain in the Excalibur book. Characters need to change and grow, and this looks pretty good as far as that goes.