this is honestly what i think is going to happen as everyone is still figuring this out and why for large companies i think they are walking into a giant ass trap and the execs can't or don't care to see it as long as it boosts the stock.
most people (read: MOST) working at X corp aren't going to be using AI to accelerate their work, they are going to "phone it in" like you said or buy themselves more time to do other stuff. i think with the onslaught of vibe and slop most people don't have a vested interest to go above and beyond to ensure quality as long as it works, even experienced devs. that's honestly probably what i'd be tempted to do.
where we see the most exponential gains will be people who are paid enough to care, smaller teams that have a direct vested interest in long term success (founding teams, etc.) or people paid to just clean up a mess.
hiring and the landscape will be super interesting to see in the next year or so. probably team structure will change drastically as well.