The Docker initiative has been an amazing thing to watch.
Over only a few short years, Docker has taken a pre-existing technology (the concept of Linux containers) and built a massive ecosystem around it. In the process, Docker (the company, as distinct from the open source project) has built itself an incredible valuation that it needs to try and live up to.
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But that valuation, and attempt to justify it, are somewhat countered by the fact that Docker also relies on an ecosystem of vendors that all try to justify their existence. Thus the challenge remains: what should Docker (the company) do for itself, and what should it leave for third-party vendors to resolve?