I've always found Hollywood's fascination with Phillip K Dick laughable, as Matheson has, IMO, contributed far more to filmed science fiction over his career. Whether it was the fantastic, such as What Dreams May Come, or the outright scary, like I Am Legend, Matheson put together a plethora of classic stories. I've enjoyed reading his work for decades. He will be missed.
Well, it's not as though Hollywood has exactly ignored Matheson's work: THE INCREDIBLE SHRINKING MAN, DUEL, SOMEWHERE IN TIME, WHAT DREAMS MAY COME, STIR OF ECHOES, THE LEGEND OF HELL HOUSE, THE BOX, REAL STEEL, THE LAST MAN ON EARTH, THE OMEGA MAN, I AM LEGEND, etc.