There are some, like Nakamura, Finn, Joe, Sasha, Charlotte, and Elias who can just make the leap because they're characters on their own that play in arenas. (the first three because they have already).

Then there are folks that got over in NXT by building a story. The Ascension, Bayley, Emma. And while there's a subset of people that watch NXT and the main roster, it's not everyone, and they need to take the time to tell their stories. The problem is knowing which is which, and it's not always clear which.