I'm unsure really, I do think there seem to be too many pronouns flying around at the moment. It's not that creating new terms to define people's sexuality is a problem, it's that some of them coming out seem quite vague in what they're trying to say it means, people even disagree with each other, and many seem so similiar I'd argue you could bunch them into a smaller number of umbrella terms which might actually make them seem more legitimate to doubters. I mean for instance every heterosexual is going to have some sort of sexual fantasy, something that really turns them on. However we don't call every heterosexual a pronoun based on this aspect of their sexuality. Even for those with fetishes, we tend not use that fetish as the pronoun to represent them even if it is such an integral part of their sexuality they practically require it for arousal.
So lets say we have heterosexual, homosexual, asexual, bi-sexual and pansexual (the latter can allow for someone who finds transsexuals where the process is not complete, thus the object of their attraction appears physiologically both male and female). I'd have thought that would be enough, you could argue for a couple more and I'd probably be convinced, but we surely don't need 50+ sexualities? As I say, that's not to say the person doesn't have a complex sexuality, just I can't see how there are so many which are so distinct from each other that we'd need that many terms, after all we only have two biological sexes for all of this attraction to stem from. There's only so many variations, and as I say I think the less confused and complex it all is, the easier it'll actually be for everyone to be accepted.