There should be more widespread gender-neutral titles, for those fence-sitting centrists who aren’t interested in defending normative gender roles but don’t have the wherewithal to transition.

Having said that, if “Dr.” is an example, “Mr.” would become gender-neutral, with “Mrs.”/“Ms.” becoming archaisms like “Doctrix”. The other alternative is further generalising the relatively novel title Mx, which would also have the benefit of infuriating the TERFs