Good question! And a tough one. I feel that as this is the early days of the ship, it could eventually die off and go back into obscurity. Though Bryan’s on tumblr, and he seems to check the Korra tag pretty often, so I do think we have pretty good odds—I see a Howrra post turning up in the main Korra tags itself once or twice a day.
Reappearing in the show is determined on a lot of things: how far into season two production the team is, and how quickly they get word about Howl and Howrra. If a season three is ever confirmed, I think our odds are pretty good if Howl remains popular, but if Korra just remains the planned two seasons for now, then it’s gonna be a close call that I don’t want to be confident in.
I’d love it if Howl made his way into the series, I think everyone is. Our hope right now is that Bryan notices Howl soon enough, and decides to do something.