There's an argument there of course, but after the novelty phase, it's hard for me to imagine that most people won't prefer genuine human channels with an actual human creator's personality shining through. Many of the more loved creators on YouTube have distinct personalities: sometimes an oddball humor, or a sense of weird innocence. Can a machine ever match that, particularly if you're aware it's a machine? Are people going to create subreddits and discords and spend hours/days/weeks creating memes to support a machine like they do because they like PewDiePie as an example?
That said, I'm sure AI content will certainly find some niches.
I could be wrong, but I hope not. If the future of YouTube is bot created videos, it's not something that seems appealing to me in the least.