Just as they did when they replaced sketch artists with photographers, and traditional artists with digital artists, pen and paper for Photoshop. We print advertising now, not paint it. Stable Diffusion won’t kill Photoshop, I use both. Just like Photoshop didn’t kill traditional art, and just like photography didn’t kill sketch artistry. But for the purposes of mass production the practicality of producing higher quality products faster will never not be sought after because time is finite.
The art doesn’t go away, but the tools available to the artist change.