What if adult content, and the unmutable element of the blockchain, is what leads to issues? Possibly even lower value of the involved currencies.
Imagine "videos found anywhere and uploaded", rights holder issues, but more so even the topic of revenge porn is a real issue if the adult sites allow user uploads. It won't be long anymore before uploading of media is decentralized too.
That said, adult entertainment adoption will undoubtedly increase interest and improve the longevity of the whole sector, but it's also a genuine minefield.