Trying to be positive and speak of an ideal situation rather than complaining about writers. Here
A strong babyface currently in NXT:
Then a character who is a perfect way to fill an Undertaker-esq role without needing to be spooky powers based:
Of course, there is
One of the best characters as a whole who can still go in the ring.
Realistically for WWE, it's less and less viable to build the entire company around just "one guy," or else it will be more likely the fans reject them. Sorry for the "smarky comparison," but New Japan essentially has 4-5 faces of the company, even with Okada on top mostly. They have Tanahashi, Okada, Naito, Kenny when he was there and now he's replaced by Jay White, and I've seen them building Kota Ibushi well and I think it would not surprise me if he wins their World title within a year or two. They have a good mix.