This isn't unique to the west though, the japanese market is going the same way, with more and more companies and creators opting for all-age. A lot of those more unique titles probably wouldn't get made today anyway as people demand a huge amount of content. I think someone (it might have been Moogy?) mentioned that Romeo had said that it used to be enough to simply add some sex scenes but now people demand school settings, and other stuff. I think it's possible that the future (japanese) market will consist of companies that release mostly moege and nukige (and titles with a bit more plot that follow a simliar "formula") which will still be eroge, a few companies releasing "plot-focused" titles, mostly without ero, possibly mainly on console, and a few bigger companies like Nitro (unless they decide to just focus on Sonico lol) and Alicesoft whose titles wouldn't really work as all age. I don't really feel like lamenting over the death of eroge when a huge amount of the writers who wrote those titles in the first place seems to have just up and left the industry, (at least the eroge part of it), with no one new to step into their shoes.