Docker the technology isn't obsolete now and I very much doubt it will be in the future. As you've noticed there's a load of solutions who make use of Dockerfi

Docker the technology isn't obsolete now and I very much doubt it will be in the future. As you've noticed there's a load of solutions who make use of Dockerfile formats and store images on Docker hub. I'd expect that there will be future developments, but that they'll be backwardly compatible with existing deployments. Docker Engine (the daemon running on a single host) and Kubernetes (the orchestration system) largely serve different needs. Kubernetes is good for large scale deployments where it's additional complexity is warranted. For running groups of containers on a single host (or small number of hosts) Docker does just fine.