I think Marvelous expected most of these games to do better outside of Japan anyway; particularly the developers of Arc Rise Fantasia. I remember reading that Imageepoch wasn't expecting much of the game's Japanese sales, but expected for a bigger audience stateside. That game has yet to be released here in America, but I expect it to do far better here, and probably gain the same audience as, say, Tales of Symphonia, since that game was arguably more popular here than in Japan.
Muramasa may be a tougher sell, because it IS heavily steeped in Japanese culture. It depends on how well Invitation markets it. Still, there have been a growing appreciating fanbase for the return of 2D scrollers, as Wario Land Shake It proved, so we'll have to see.
Rune Factory Frontier would have been a hard sell either way because it is a very, very niche title.
The same thing may be true with Little King's Story.
In short, Marvelous needs to get better marketing skills for its Japanese releases, but hopefully stateside releases for their unreleased titles will fare better. No More Heroes got lucky enough to get a sequel.
On an off-topic note, what I find strange is that, while No More Heroes didn't sell much in Japan, it still got a full soundtrack release. Muramasa and especially Arc Rise Fantasia have yet to receive such a treatment. On the flipside, Fragile got one four months AFTER its Japanese release, so who knows? It could happen.
