#3 Samoa Joe
Having a list of future WWE Champions and not mentioning Samoa Joe on it is a foolish mistake.
Samoa Joe has accomplished so many things, not only in WWE, but also outside of it.
Joe has already held the NXT Championship a few times in the past, and though "The Samoan Submission Machine" hasn't been able to capture a title on the main roster as of lately, I think the year 2019 could possibly do wonders for him.
As Joe is one of the finest superstars WWE have, there's no doubt in mentioning that Samoa Joe is definitely going to get a hold of WWE's top prize, the WWE Championship.
That being said, I think, as soon as the SummerSlam PPV is in the rear view mirror, Joe will be the next challenger for the WWE Championship. Just imagine Finn Balor and Samoa Joe feuding over WWE Championship. It's worth every single penny.
Also, expect his reign as the WWE Champion to be a longer one.