I believe that this will change absolutely NOTHING. There was a similiar case regarding "inappropriate" content in Eroges a few years ago and the companies "agreed" to not do this anymore, and see how much it changed since then.
Also, maybe I'm wrong on this but as I've heard, just like the prior case, it's not something enforced by law, just an agreement by producers saying "we're not going to do it anymore", but with their fingers crossed behind their backs. In the end, nothing is gonna change and even if it does, there's still doujinshi and fangames.
This stuff is Japanese culture. There's no [tornado fang]ing way that it'll get put away like this, just like there will always be giant robots in Japan tearing each other to shreds and punching holes through time-space.
And besides guys, most people rather watch Hentai (which is not affected by this stuff at all, so [twin slasher] away) instead of playing Eroges. I on the other hand am worried if this in some way or another might affect the Tsukihime remake.