I'm not really sure what the direction is for Epico & Primo. Their characters, based off the vignettes, seem to suggest that they're upper class, elite Puerto Ricans who view their country, their culture, their women, etc. as superior to that to the rest of the world. Even though Puerto Rico is a United States territory, the feeling I get is that they're going to be the arrogant foreigners who feel they're superior to Americans.
For me personally, I don't see Epico & Primo headed to the tag team title picture anytime soon. Ultimately, I think they'll help bolster the mid-card tag team scene, and that's a good thing, because there's just too many other teams right now that I don't think a whole lot of fans are going to want to see them pushed ahead of. Gallows & Anderson have already generated buzz, Enzo & Big Cass are already over with the fans, the Vaudevillains are making solid, steady progress, the New Day continues to be entertaining & doing a great job as champions, you've got veteran tag teams like the Usos & the Dudley Boyz on the scene, you could potentially have Erick Rowan formally return to the tag team division once Luke Harper returns from injury, or you could possibly go the route of pairing Rowan with Strowman. In NXT, there's a ton of positive buzz and excitement surrounding American Alphas, Blake & Murphy have a lot of potential & could be brought up at any time, same with the Revival.