Mesos is a form of virtualisation - just a different type.<p>I am not surprised HortenWorks customers are on containers &#x2F; bare metal - the over head for their workloads that would be caused by a traditional hypervisor would be costly.<p>For single tenant DCs - there might be less virtualisation in coming years, but Mesos &#x2F; Docker have not yet implemented the same layer of isolation that KVM &#x2F; Xen &#x2F; ESXi have, so we will still see (traditional) virtualisation in shared environments.<p>Also - Amazon &#x2F; Azure &#x2F; Rackspace are quite definitely not going to have it relegated as legacy.