If AI displaces human educators, yes, their supply shrinks -- but we can't assume what direction its demand will go.
We've seen this pattern before: as recorded music became free, live performance got more expensive, and therefore much less accessible than it used to be.
What's likely to happen is that "worse" (read: AI) education will become much cheaper, while "better" (read: in-person) education that involves human connection-driven benefits will become much less accessible compared to what it is today.
Most people may be consider it a win. It's certainly not a world I'm looking forward to.