Nope, a lot of publishers are open to bringing niche games like that over now, plus they obviously sell well enough to keep them coming, we live in weird and good times
If this is the trend, I have to wonder at the attitude toward it for the market that's usually into games like this. Usually this kind of stuff has to be made by an indie developer and released for PC download or something. If it's crossing into the mainstream, do the games compare in "feel" to the way other games alike do?
Basically, if you're into ero/ero-esque games and you've been into it for a while, does this sudden turn for the "mainstream" feel weird? Are these good times weird enough for you to do a double take and say "That got an English localization? How do I feel about that?"