Money Quote: "It should not be surprising that it has taken time, because it is a reflection of trends we’ve seen with other technologies."
Bingo. I've been selling ERP for 30 years and I still don't know too many companies that would *publicly* acknowledge ROI from their ERP investments. The keyword is "publicly". As anybody who has worked with ROI models would know, ROI calculations touch upon many parameters about the inner workings of a company and quantitatively, not just qualitatively. Going by the truckloads of money invested by companies in new licenses, upgrades, etc. of ERP, they've surely gotten ROI from their ERP investments, just that they don't need to disclose them publicly. This has also been true for SAAS, Cloud, and many other gamechanging technologies of the last few decades. I agree with McKinsey that it won't be any different with AI.