I disagree. When you think of all the functions the vmware hypervisor has a range of features where it is quite far ahead of the competition including Fault Tol

I disagree. When you think of all the functions the vmware hypervisor has a range of features where it is quite far ahead of the competition including Fault Tolerance. vSphere is the management interface, its telling the vmkernel to do things, but the vmkernels are able to do a lot of work without the vsphere service being available (HA, etc). VMware basically invented the modern x86 virtualisation environment, and there is still a lot of value in saying that they do it best as they have the most experience. Make that a commodity and I don't think you have the industry leader anymore.