This is likely an article for big companies to move their apps to GCP. Google probably wants them to be able to utilize preemptible nodes to reduce cost and with a monolith you can't really set meaningful service levels agreements if you do not have reliable hardware backing you.

I don't think "microservices", the idea of having an interface between two systems/codebases/libraries, will ever die. The more microservice-y bits, seperate apps with RPCs, makes this sort of work much easier.