We don't live in that world. I don't see the point in talking about how we all know it should as opposed to recognizing that it isn't and working towards getting that diversity and bringing fair opportunity to all those that want to get into the industry.
Because working towards getting that diversity and bringing fair opportunity requires identifying the policy and practical measures we can take, while recognizing the actual counterfactual we would like to strive for that sets a clear, objective target for our goals.
"Diversity" and "fair" are ill-defined concepts within the context of employment. Understanding the baseline we are shooting for (be it population-proportional representation or equal representation -- I'll remain agnostic for the purpose of this point) is essential.
No. And the problem is that we live in a multicultural society. Theoretically everyone should be able to have access to the same things. Currently that is not the case. It's obvious that 9 times out of 10, due to a multitude of factors, white actors will end up winning out. Maybe some people take issue with that. Maybe they want something that can change that and grant greater opportunities to everyone. A "proportional" system will not change that. It will simply retain the status quo. That's why such a system is problematic.
I don't think I'm going to change anyone's minds on this so I'll probably exit the discussion now. Things just seem to be going in circles which is disheartening. Just goes to show why things are the way they are, I suppose.
You are not changing anyone's mind because you are not making a clear point. Proportional or equal representation is an outcome, not necessarily a policy. Proportional is not the status quo, it's in fact (I'd assume, since I haven't seen the data directly) below where we currently are, where white representation is well above the proportions in the population.
If you still don't think proportionally is the correct outcome to shoot for, I'm all ears, though. There's an argument to be made that proportions perhaps should be skewed more in favor of minorities to drive an industry faster in a more progressive direction, especially when it comes to the arts. It's not the argument you are making right now, though.