Sure, there's a place for disposable, ultra custom apps that AI can cover. I vibecoded one to help me clean up my local media with a tinder-like UI for discarding/keeping photos, for example.

That's not going to substitute many engineers though, for two reasons.

One is that "app that helps a single-digit number of people" was never a viable business in the first place.

The other is that you can't substitute all corporate software with a combination of disposables. Some stuff is complex even if the "surface features" are small in number. Say for example that you want a custom web browser, "surfing the internet" might feel like a single feature for a non technical person but it's made of many moving parts inside.