It'll be interesting how that shakes out with legacy tech platforms. A lot of the high profit tech is built on stuff that's more than 10 years old.
I currently work on a monolith customer service application that did $2.8bn in sales last year (we are a high margin company but sales $ amount is the only data available to me - projected to do ~$3.8bn this year). It's built using Eclipse RCP and a microservice architecture that consumes from a mix of DB2 LUW and AS400(IBM I) lol. It's about 13 years old.