To answer your question directly: yes, I think it would still be fair to ask for the support. But in that scenario it would also feel stingy, so I personally would not. Someone else might, and I would still think the claim was fair in principle.

What I want to ask in return is whether you are genuinely concerned about that scenario. I do not believe financial success is likely to be my future.

And to be clear, if it turns out I can fully support myself, I am happy to forego your support. I am not trying to hoard money. I am genuinely afraid that I will not be able to support myself.