There's been rumors for years that the many changes Superman has undergone have been motivated by DC's fears of losing exclusive rights to the character. This was reportedly the reason behind Superman's costume change and the sidelining of Lois Lane in favor of Wonder Woman and the loss of the Clark Kent identity, so that the elements contained within Action Comics #1 would be less prominent, leaving only the aspects of Superman's lore that DC retain a firm legal hold of.
Could this be part of the motivation behind the Jonathan Kent character being promoted so quickly into the main character of the franchise? Or does it simply come down to DC's inability to make the classic Superman resonate with enough readers so they are replacing him with his son in hopes of attracting a larger audience?