I'm having a hard time seeing how increasingly better and freely available AI artwork doesn't just completely replace artists (and more generally how increasing AI capabilities don't just replace any career that does not involve some degree of skilled manual labor, at least until AIs get robust manual capabilities). In particular "higher-level artistic work" would seem to be that work which rises beyond what most artists do today. Prompt engineering is a far cry from making a painting oneself and there are likely many people who enjoy the latter who do not enjoy the former.