Cass will get an upper midcard push, but probably flounder in a few months away from Enzo. Without his connection to Enzo, all he has is that he's tall and he's mean. You could say that Baron Corbin is the same way, but Corbin's size is secondary to his character. He's primarily a fucking asshole who doesn't like anybody and who just so happens to be pretty tall.
I think the WWE is "pushing" Enzo for this Cass feud, but they want to strap a rocket to Cass, not Enzo. It will not work as they have hoped. Enzo will continue to get over with his mic skills, but Cass will need to reestablish himself and his character once this feud is over.
I could see a great Enzo redemption story if he ends up feuding with Neville to try and make something of himself. Their promos together would be insane.