Unlikely in the near future, highly probable in the longer term. Imagine writing a script (movie) and having the AI generate the characters ... storytelling to a new level.
Avatar Digitization From a Single Image For Real-Time Rendering
http://www.hao-li.com/publications/papers/siggraphAsia2017AD...
(from the people at Pinscreen)
There's a lot of work being done on using deep learning for computer graphics in general as well.
It's not AI, but MakeHuman[1] has parametric features for human meshes[2], and you can hit "Random". It also has sliders for age and gender parameters. I last used it a while ago, I'm sure I'm underselling it.
This approach doesn't work very well because simple linear morphs don't account for all the correlations and multidimensional variations of an actual human body shape, resulting in similar or unrealistic body shapes. It's like nudging a face in a photo editor. Different characters in Daz Studio are still hand-crafted in a separate 3D modeling software, and just adjusted with the morphs.