As a counterpoint, you are lumping a lot and generalising a lot there, if we're specific then you can't really trivially replace e.g. the Linux kernel with an AI project in whatever language you want. An incredible amount of work has gone into the Linux kernel and its design, and the infrastructure under that veneer of a "UNIX kernel" is too significant to hand-wave away. The issues facing Linux are well beyond (but not excluding) those created by using a dangerous language like C, or using hacky/outdated UNIX interfaces and conventions.

Yes you can try and take things in an original direction but we're ignoring the incredible amount of work that's gone into Linux, solving most of the problems you can't imagine and that AI will burn though a lot of time and tokens trying to re-solve (badly, without a ton of intelligent intervention).

I think you're more likely to see more people experimenting with existing open source work, rather than generating new projects. These new projects are easy come, easy go.