Yes, it's unfortunate, and the thing is, it hasn't always been like that.It's always been an insecure profession, but it used to be there were a lot more wc people in the arts generally.
Quite a few reasons for that I think. Increased cost of living being one. Fewer places for kids without money to get training, or cheap places to hang out and jam.
Having to pay for higher education, not only the direct cost but the time not earning. For people from a wc background apprenticeships are often much preferable.
Programs for the disadvantaged seem to revolve around identity politics groups instead of income. Often though, these programs end up being full of people with the relevant characteristics who are actually pretty well off.
I will also say though, that it seems to me now that kids are much more inclined to spend their free time online rather than taking up hobbies and interests that take dedication to perfect. I am sure that's a factor in the fairly shit music industry there days, and I would not be surprise if it is also true with actors. I suspect many don't have the focus to watch plays.
I think even more than the loss of wc actors, wc writers are a problem. A lot of the crap television writing now, I suspect, is coming from people with a very samey background.