It really didn't. I can tell you with first hand knowledge the majority of the internet by any measure, but especially high scale systems where I've worked and know much of the small community, use neither Docker nor Kubernetes. That's not any indictment on either technology it's just simple fact. Fad tech appears a much bigger tiger in echo chambers like this website but the majority of the companies aren't even using languages that are popular to this crowd let alone tooling. Whether or not these tools have staying power or contribute meaningfully to the industry the jury is still out on, and will have to wait about 5 years to tell. In the past you "were an idiot" if you weren't using C++ or CORBA or RPC or Java or SOAP or message queues or Ruby on Rails or AWS or or Hadoop or OpenStack or blockchain or machine learning or.. all of these are fads and all that mattered then and now for consumers of the tech is solving business problems cost effectively.

Software developers are an incredibly easy demographic to influence with marketing. There is an industry of startups that have been minting money on this for a long time. But it's important to know that a lot of software development tools we use are just fashion statements.