LOL, I don't know when 100K became anything EXCEPT niche. Way to lower the bar. Oblivion, i'm done since you fail to see how niche sales are niche.
As fro Dragon's Crown, I don't see cross-play getting more people to buy a game. So I don't think they will lose any sales for it, but Vita hardware and software sell like horse dung covered in rotting corpses, so I don't see the Vita version doing that well at all.