People already have access to every form of niche pornography they could dare to imagine (for absolutely free!), I really doubt that 'personal taste' is the part that makes OF models their money. They'll be fine.
A big part of it also the feeling of "connection" with the creator via messages and what not, but that too can be replicated (arguably better) by AI. In fact, a lot of those messages are already being generated haha.
What's astonishing abut the present is that even PKD did not foresee the possibility of an artificial being not only being constructed from whole cloth but actually tailored to each individual.