I mean if we want recent examples just look at tailwindui since it's technically a SaaS.
This is a terrible example. Show me someone ripping out their SAP ERP or SalesForce CRM system where they're paying $100k+ for a vibe coded alternative and I'll believe this overall sentiment.
Just because it cannot be done today, doesn't mean there is not a real appetite in large enterprises to do exactly this.
Without naming names, I know of at least one public company with a real hunger for exactly this eventuality.