I aldo don't think that it makes it "cheaper, more accessible, and allows more people to create". Digital art supplies being something readily available and relatively cheap to their classic counterparts is what makes things more accessible, and to make it more so would be to drive the cost down or something. Having the computer draw for you isn't exactly creating art.
And art isn't a commodity and I argue it shouldn't be a commodity. It's something, again, personal and special.
And this doesn't end at the visual arts, I think it applies too to writing. AI could write what's written in my journal word for word but my journal would have more value just by virtue of it being written by me.