These days, more doctors and professionals (i.e. audiologists etc) need to be trained or at least made aware of various options when they go through their chosen educational paths. Older doctors et al don't have that opportunity unless they make the effort to go to conferences and so forth. BUT I think that higher education ought to have some kind of course/program to provide knowledge of resources for ANY disability.. or at least know where to look for said resources.
Plus today, most parents have the internet at their fingertips and may likely come across many different things while searching "What do i do? my kid is deaf" in google or bing or duck duck go.
There 's no answer but there's no excuse either- right now there's far better chances and opportunities to find resources than there were decades ago and maybe...just maybe less of professionals with extreme biases such as "Learning sign will stunt their speech", or 'Learning sign will limit them too much" or..."Oral is bad bad baaaaaad" (yes all of the above reared their ugly little heads after the ban on sign language(s) at the Milan Conference in 1880).
Resources were very little for my parents other than their primary doctor (I'm guessing here... my family is not known for talking...). I don't know how they came to find out about PSD or cued speech (in its infancy at the time) or the other pre-K programs for oral deaf kids in the area. Can't have been easy like it is today with a google click away. They did their best but doesn't mean that I don't wish I had sign language in my young years.. I do. (But I can see why at least my mother was not happy with PSD.. they wouldn't take me probably because of multiple disabilities (deaf and legally blind) and from the story I'm told said I was mentally retarded- !