Mustang Sally
Sells seashells by the seashore
I can see the logic in keeping Cody as the Intercontinental Champion a little longer. He is not fully ready to main event yet ....
I can agree with that and it frames the question asked by the OP. I don't see either Cody or Dolph as main eventers, either now or in the future. They don't possess the personality and charisma necessary to be at the top of the card. Now, many folks would read that statement and presume I'm saying that neither guy is any good. That isn't the case; they're both fine......on the mid-card. I enjoy watching their matches and appreciate how hard they work.
But....personality? To me, no one is more bland than Cody Rhodes. He speaks (I'm told) in a monotone voice and delivers his words in deadpan fashion, whether his gimmick is dashing, disfigured or whatever it is he's doing now. He isn't that interesting a character, but his gimmicks are interesting, which is indicative of the notion that a performer isn't going anywhere until Creative gives him something to run with. No one in WWE has been the beneficiary of management's largesse more than Cody Rhodes.
With Dolph Ziggler, it's not that he's been given gimmicks to run with as much as he's been given constant exposure. His matches are terrific, but except for Vickie Guerrero, there's not much else to Dolph's persona. He has a prodigious workrate, and I'd bet that other guys on the roster wonder why Dolph appears on just about every Raw and Smackdown while they sit and wait for a chance.
It could be that some new main event guys are needed, yet there's really no one available to fill the role.......so they're feeding us guys like Cody and Dolph.
It's not a pretty picture.