If you've ever tried to build something real with agentic AI, you know that it takes time. You can't (yet) snap your fingers and produce a fully market-viable clone of a SaaS product.
The specifics matter here. If you run a CRM for Dentists, can someone replicate your product in a weekend? I'm going to guess that dentists have some esoteric needs related to their CRM, and it's a little more complicated than an outsider might guess.
So what is the threat model? That a dentist is going to get fed up and try to DIY? I think you should encourage that, so they'll see what goes into it. That a 22 year old chooses "CRM for Dentists" as a thing to vibe-code over a weekend? Again, good luck with that.
I really dislike this SaaSocalypse fear mongering, because it's just not based in reality. Show me five examples of established SaaS companies being wiped out by vibe coding.