Sounds like the Dwayne Johnson project is at best delayed but more likely not going forward. With the advent of high profile failures of vintage genre pics like King Arthur, The Mummy and some years back John Carter, it seems the studio may be thinking twice. After all the wrong-headed takes I heard from Dwayne Johnson on Doc, I'm a bit sad but more relieved. Link
Personally, I'm hoping that another Doc Savage movie never gets made, unless its CGI or animated. Because anyone they cast to play Doc isn't going to look right, and casting appropriate actors for his aides (and Pat!) would be difficult.