Keith, if I were you, I wouldn’t be too worried about recent, nice looking (and nicely working) updates of other applications. For in my opinion, as a working environment Scrivener has no real competitors; at least not for a certain kind of writing activity.
Ulysses certainly is a quality program, but it’s not the best possible choice for writing really complex things, like for instance PhD theses. But probably one must have written similar things in order to fully realize this, and to fully appreciate Scrivener, with its great versatility, its crystal clear UI and its wealth of inline notes, inspector notes, annotations, comments and the like. It is in this field that Scrivener really shines, and proves itself by far superior to all other applications. To many, all these options may seem overkill; but not to those who have gone through certain creative experiences.
And LaTeX is of course by many miles the best thing in the world as a layout tool. But it is not (and was never intended to be) a working environment. Or perhaps it is, but only for experts in mathematics, theoretical physics and the like; not for experts in ancient philosophy or medieval history or female literature.
And I can understand the decision to make an iOS version of Scrivener: people want it, scream and shout for it, and blame you for being old-fashioned (to say the least) if you don’t offer it. And of course commercially it may be quite interesting; and there’s absolutely nothing wrong with that.
But personally, I wouldn’t care if there never came an iOS version; and not only because I don’t have an iphone nor an iPad. Because if I did, for jotting down some random ideas on these any decent application would suffice. And it would never cross my mind (nor would it cross anybody else’s, I suppose) to do any really serious writing on an iPad. So I don’t think I would ever feel an impellent need for an iOS version of Scrivener.
But of course I fully understand and respect the wishes and needs of others, and the strategy of the company.