First you say this

Naturally, this has human actresses scared to death. If Tilly becomes a hit, the future for the traditional starlet is bleak. While there will always be some market for humans, it will dwindle until it become niche.

then you say this

We are entering the age of abundance

Which is it? Wide-scale unemployment or abundance?

How will people put out of work by AI and living under bridges in boxes afford to pay the AI fees?

Right now AI companies are subsidizing the costs with venture money, at some point those people are going to want to see returns and all this free ride will start adding up to big costs, but there will be no alternatives left.