Found this quote from Tetsuya Takahashi of Monolith Soft; "Completely serious though, I would like to do a Z rated game (equivalent of M in America), and just do whatever the hell I feel like doing"

https://www.resetera.com/threads/koh-kojima-wants-to-make-xenoblade-x2-xenoblade-3.44474/

Seems like Monolith Soft is interested.