Silent opening in NY was one of the rumors of the season in Paris... some said it was going to happen soon, some that it wasn't. I guess their website is giving us a reliable proof they did it.
Now if it's going to work, only time will tell. But I believe it's quite a smart idea, especially for a "personal agency" as you say. If they are able to work it out, it's great to push the concept as far as possible, with a very tiny and select roster. As for partnerships with others, I don't think it will be a problem, they've already managed Anna this way for a few seasons and now Othilia. It's just getting more official.
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THIS IS the near futur of modeling
web, video, all modern comunication technologies....who the hell needs a team of 20 bookers in 5 cities, to manage girls?
Does a rock band need a management on every continent, and need managers different in Paris, Milan and London to manage a european tour
A bit like the big airlines companies who have needed Virgin and Ryanair to arrive, to start to think it was possible to reduce cost,
It seems no one in modeling ever thought the whole thing could be managed in a MUCH cheaper way than what they do since 20 years...

In fact, not exactly everybody in modeling did not get it, notice that in asia, including in Tokyo, agencies work like that since ever, very small team of booker, very small number of girls to manage...and everybody makes money
How silent will do? well easy, basically as Penny points, they do it already since 2 years, and as long as the number of girls is kept low, that proove already to be no problem.
Silent seems to know rather well what they are doing, they have waited 2 years to show it a bit more officially, but fact that it is 2 years they prepare the field, gently, almost in...silen(t)ce....