Saaspocalypse

What are everyone’s thoughts on the theories that the introduction of very advanced coding agents such as Claude code and codex are going to spell the end of many saas businesses? It’s the theory that companies will just build these tools internally rather than pay for them. For example for my business (which I will not name, this is not an ad in disguise) I built my own cold emailing sequencer, equipped with variables, staggering of emails etc. this took me under an hour. I used to pay a company for this. This is one example of mine that full backs this hypothesis. Any other examples or thoughts?