Interesting comparison and I think you are accurate re: marketing saavy. But I find both Rockwell and Warhol more interesting subject-wise and better interpreters of their contemporary cultures. I wonder if Kinkade will connect that deeply and that broadly in the long run.
One aspect of Rockwell's art that fascinates me is that it's almost always about people, and I don't recall a single person in a Kinkade painting.
(Okay, except Looter Guy.)