Technologies and hype cycle come and go. The bleeding edge today might be the forgotten rusty blade tomorrow. So it's important to choose the right (ie. going to be well supported) tools for building infra, which will likely need to run for quite a while.
Nobody has a crystal ball (if you do please share), but the community (people/companies with marketing power) is moving in certain directions.
see CNCF landscape
These things are unlikely to get replaced anytime soon
Things that already form core components but still need a bit more convincing that they are essential