Is SaaS Really Going Extinct Tho?

In There Is No Product, Sidu Ponnappa explains that "the fact that anyone can build it is precisely why it can’t be productised." If your software can't be productized then you don't have a business. To be a product worth building it needs to be something hard to make. The problem for a SaaS business is that with AI, what is "hard to make" today might be easy tomorrow. Eventually any software that can be made, can be made with AI. So does that mean SaaS goes the way of the dodo? I have a hard time believing that.