I'd have to read up on the legal stuff, but it wouldn't surprise me if they got the name back at some point. As for the movie, I'd love to see a Shazam movie done right, key word done right. I just can't see it being made anything special in the current Hollywood climate. Like I was just watching the Tom Tyler Captain Mavel Serial the other day for the first time in a long while, and really, that's all that ever need to be made. Perfect.
The idea of them not being two separate beings was always stupid IMO. It's key to the premise of the book. Really though, if I had my way Captain Marvel would never be a part of the DCU, they have treated him terribly the last 10 years. It makes no sense for him to languish at DC when literally any other publisher could easily be telling great stories with him. If I had my way he'd go back to the Fawcett universe and just pick up from there like nothing happened.