Bootstrap founder in that field. Fully autonomous is just not there. The winner for this "generation" will be with human in the loop / human augmentation IMO. When VC money dries out there will be a pile of autonomous ai pentest compagnies in it.
Juniors will have a hard time that I agree. The current level of findings of LLM is at their level.
I don't know enough about the low-end market to rebut you there (though: I saw what my muni paid for a bargain-basement assessment and was not OK with it), but the high end of the market definitely has not been slaughtered, and I definitely think that is coming.