No offense to any of the Saab fans out there, but I just don't think he has the taste or refinement that the Valentino label demands. Even when Val went full on high octane glamour, the taste level was undeniable. He had an innate ability to know precisely when to stop embellishing a dress so that it doesn't look garish or heavy handed. Elie Saab's aesthetic might be in the same realm as Valentino's, but they're really worlds apart.
Same with Valli. Yes, he abides by the same laws of beauty, elegance, glamour and femininity as Valentino, but Valli's designs inevitably wind up looking like they were forced. Valentino's woman was always very lacquered, very made up and done, but that's just how she was, she left the womb with a perfect chignon and spent the rest of her life that way. With Valli or Saab's woman, it's like they're trying desperately to be that Valentino woman but not quite pulling it off naturally. Plus, no matter how gorgeous their work is, you can't beat around the fact that their stuff looks labored.
What Valentino needs to carry on the tradition is a) someone whose frame of reference isn't exclusivly in the world of mid-century couture and up-on-a-pedestal beauty and b) someone with a light hand and an understanding of when to stop working a garment.