for that reason alone humans will always need to be in the loop. of course you can debate how many people you need to the above activity, but given that AI isn't omniscient, nor omnipotent I expect that number to be quite high for the foreseeable future.
one example - I've been vibe coding some stuff, and even though a pretty comprehensive set of tests are passing, I still end up reading all of the code. if I'm being honest some of the decisions the AI makes are a bit opaque to me so I end up spending a bunch of time asking it why (of course there's no real ego there, but bare with me...), re-reading the code, thinking about whether that actually makes sense. I personally prefer this activity/mode since the tests pass (which were written by the AI too), and I know anything I manually change can be tested, but it's not something I could just submit to prod right away. this is just a MVP. I can't imagine delegating if real money/customers were on the line without even more scrutiny.