I'd be totally fine with this Mulan not being a musical, for that's a easy way to make sure it's going to be it's own film and not a copy of the animated film.
However there's a catch to that piece of news, for it's "No songs right now" or "As of now there's no songs". Until we get firm answer that there's no songs period, there's still a chance they can be forced to add songs into it. Since it pains me to say that the bigwigs can just look at the money BatB is making and think that's what they need to do instead.