> I can imagine open source projects that will revolve entirely around specifications

This is a really good observation and I predict you will be correct.

There is a consequence of this for SaaS. You can imagine an example SaaS that one might need to vibecode to save money. The reason its not possible now is not because Claude can't do it, its because getting the right specs (like you suggested) is hard work. A well written spec will not only contain the best practices for that domain of software but also all the legal compliance BS that comes along with it.

With a proper specification that is also modular, I imagine we will be able to see more vibecoded SaaS.

Overall I think your prediction is really strong.