I'm not sure he's been forgotten, but he has certainly been eclipsed. Perhaps his color work has been an obstacle....he uses much less saturation than more "popular" color photographers which makes his work a bit more subtle. In fact, looking just now at his monograph Cole Weston, At Home and Abroad I have the feeling that a lot of the 'graphs therein would have worked equally well in black and white. I also wonder if his consummate passion for acting and sailing mitigated against a more aggressive career as a photographer in his own right as I suppose the bulk of his living came from printing his father's work. In any case, he's certainly not been forgotten by me. I really like what I've seen of his stuff (albeit in books rather than "live".)