itunes going away? what about my dvd movies

I had a ton of DVD movies that I converted to mp4's and loaded into iTunes. I have an Apple TV 4 and, although I have a MacBook Pro, I have stored all my movies on a NAS device (Drobo) via my Windoze 7 PC. I have pointed iTunes to the appropriate directory and everything works great.

With Catalina coming out, I read (again) about iTunes going away.

So what do I do about all those MP4's I have? Is there a better way to have my Apple TV see them ? Right now, I instruct iTunes to share them and use the "computer" on the iTunes app.

Jerry