I think a bigger issue is the impression of OMK itself in the fighting game community, where it doesn't seem to be very popular or seen as competitively viable. This is a death knell to interest for most games. On the other hand, a game like Melty Blood was popular for a time even though a lot of its players didn't know anything about the source material.
So I could see the lack of interest not reflecting all that much on the popularity (or lack thereof) for Umineko itself, but for OMK as an actual fighter in particular.
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