What applications can Docker bring?

  docker, question

Recently, news from Docker has been everywhere, and news from CoreOS and ZeroVM has also appeared sporadically.
When Docker’s ecology matures, what applications will it bring that are not or are only marginal?

Before we used docker as the development environment, we were all connected to the openstack virtual machine for development. Later, resources were a little tight, so we opened several dockers in each virtual machine, deleted the virtual machines of the people who wanted to use Docker, and then changed from shared rent to upper and lower floors …