Why are you making such wide assumptions? I pay for art constantly. Where's this blatantly wrong suggestion coming from?
ai art is worthless to me so I'm not going to pay at all for anything making blatant use of it. So why would I use something I won't pay for as an excuse to complain about prices for stuff I do value? How about we wait for something actually approaching quality to come out and debate over instead of playing theoreticals with that which does not exist yet?
If these AI productivity gains had 4 years to work on a project it should be making something impressive by now, no? So where's this magical collection of productivity that's disrupting art and driving down wages?