This is the first time the average American has gotten to know a trans person *before* transition. High profile trans women, from Christine Jorgensen and Renee Richards to Laverne Cox and Janet Mock were all introduced to us after transition. True we saw Chaz Bono as a kid, but more as a TV prop than a person we got to know. But we've seen Bruce Jenner through his days as an athlete and on reality TV, so people are getting an idea that we might have been like beforehand. I think that goes a long way to humanizing us.
So many people were in disbelief when I transitioned because they had seen no sign of it from the pre-transition me. The expect pre-transition trans women to be super gay guys, not ordinary seeming folk who were born with a need to inhabit our true genders.