You can say that a SaaS consists of two components, the features and the data on which those features operate. If the cost of feature development goes to 0, and development speed goes to infinity, you can no longer compete on features alone. The Constraint shifts; it's no longer what features you can deliver, it's whether you have access to enough data about the business to deliver those features.

Instead of traditional, siloed, rigid web applications, I think the pattern for the AI era will be an "enterprise OS", some kind of Salesforce / ERP-like platform where all the data about a business is kept, and where applications like Slack or Jira exist as plug-ins consuming the database. Such a workflow makes it trivial to do a one-off task using conversational AI agents, or even to vibe-code a workflow-specific app that does one thing well, one thing only, and exactly how this particular business needs it done at this particular time.