> Increasingly, the only engineers that non-tech companies need are people to manage their data, people to glue the SaaS APIs together, and maybe some frontend people to put a custom interface on it.

I presume you didn't see much industry yet. In reality, every existing company that is around for 10+ years have already tons of legacy apps or apps nearing that threshold, a lot of times tightly integrated in the rest of ecosystem. That isn't going away for some shiny new SAAS overnight, nor over year.

I've been hearing similar predictions since at least 2010 and they are just not true for much of the business.

Our bank (and in bank, IT is always just a cost center) has tons of external SAAS systems. Yet our internal systems grow, their integration grows and we are actually hiring more people to handle all this.