"Might" isn't fact. Moreover, the interview wasn't a pre-season hype PR piece, but a post-mortem after the episode aired.
The most interesting is how the show treats the reveal as an identity crisis for both Dany and Jon, as well as a roadblock for star-crossed lovers. The pretext is political, but as far as Dany and Jon themselves as concerned, it's only personal.
In the light of what happened in S5, Edric Storm was imo only a stepping stone on the way for Stannis to burn his own daughter (first, sacrificing a nephew he knew and liked). In the light of what just happened on the show, if Gendry survives his endgame has to be linked to Arya's, so I don't think he'll be given anyone else's. If he survives.