I hope Disney continues to normalize families of all genders and races. I suspect that they've got to tread a fine line not to alienate everyone, yet still keep pushing the envelope. There are certainly enough princesses out there whose orientation simply isn't discussed, who could all be potential gay princesses. Now that I think about it, though, I am probably coming around to your view that it will probably be years. Not because people aren't "ready" for a gay princess, but because right now, the princess' orientation would end up being THE story, that would swallow any other message or theme in the movie. And probably also run counter to normalizing non-white-cis-hetero families.