Cloud did kill on prem - ie Siebel, Saleslogix, lotus notes/domino
Then you have the infra side (and consultants) killed by SaaS ETL apps, hyper scalers (aws, gcp, azure)
Many weren't βkilledβ they were effectively rolled up PE style (cognos, Hyperion, ultipro, peoplesoft, etc).
And some adapted - ceridian, oracle, sap, adp (sort of), etc.
It's never as obvious as Netflix killing blockbuster, because acquisitions get touted as outcomes.