Consider there is not one recorded case anywhere in the country of this being an issue. Then consider the damage similar laws have done in states like North Carolina where conventions, companies and others have pulled business from the state. In the midst of a recession where we need to expand and diversify our economy Prop 1 could slam that door shut.

Additionally from a social standpoint, the trans-person is far more likely to be a victim and be uncomfortable in an environment than a cis-person. You talk about stalls in bathrooms, and I have to believe that most of them would probably be changing in stalls anyway to protect their identities and privacy during a socially awkward and taboo transitional period.