I have been on that train too. Ryu is in all places except NINJA GAIDEN.
I really hope that, with the success of DMC5, Team Ninja come together, stall Nioh and DoA for a bit and make a Ninja Gaiden. Though idk tbh. Though honestly the series has declined ever since Itagaki-san left, so idk.
But even if they do make an NG, I really hope it can compete with DMC5 and not be made for commerciality. It would be fun to have the pinnacle of action games back <3