WWE simply has many things going on and so ideas do not always make it onto WWE television. Vince McMahon has the last say in anything that goes on in the company.
On Wrestling Observer Radio, Dave Meltzer discussed Vince McMahon dropping pushes for Superstars. He then talked about a storyline that was nixed, even after it was tested during house shows. He revealed that Drake Maverick was initially going to be the manager for Corbin, but that did not end up happening.
It was also noted that if WWE decides to return to that storyline with Maverick, “they’ll have to bring in another writing team because [Bruce] Prichard won’t be doing that.”
For now, there seem to be no plans for any change in King Corbin’s storyline.