I have a a theory that LLMs are going to be the death knell of big SaaS. It's so much harder to build and maintain an massive SaaS that does 80% of what 80% of your customers want, than it is to build something small and simple that does 100% of what one customer wants.
Maybe once the model can administer and operate the service too.
For now building the 10% of the SaaS that you need still leaves you operating 100% of a new service/process