SaaS disrupted legacy software packages such as SAS, now AI is disrupting SaaS.
https://www.forbes.com/councils/forbestechcouncil/2025/02/19/how-ai-is-disrupting-the-saas-landscape-and-reshaping-the-future/
TL;DR: fewer knowledge workers are now needed in enterprises due to AI helping with all knowledge "tasks", therefore fewer "seats" are needed for SaaS subscriptions