>>4 Yeah, Fantastic Children is a great series, but I think surprisingly many people have seen it, regardless of the unappealing name, slow pacing, and the icky taste of licensing. Mahou did a decent job with their sub, and I doubt distribution has been poor enough to keep anyone from watching it.
Many people have been turned off by the mystery and weirdness in the first half of the series, but since this is for once an anime in which the loose ends are tied, it's just a matter of patience - which shouldn't be too rare a trait amongst otaku.
I believe good anime just doesn't stay unwatched nowadays, besides, timeless shows like this get more and more viewers in the course of years, unlike super-popular shows that are based on a temporary fad.