Next to it, it is for IT departments an ideal world that all users will have one and the same desktop. But the users do wish their own desktop, which is also possible with the current VDI solutions. At this point, ZCM can deliver the needed updates, patches and new programs. vmware, xendesk and the others do not provide a solution.
If you look at XENDesktop, it uses vhd file in the background. One vhd with the master image, one vhd file per catalog and after that a vhd file per user. All on a ext3 (because the default LVM format does not allow think provisioning) which in the end is accessable for ZCM on Linux or thru a NFS share for Windows server. That way, ZCM, if it could work directly with the vhd files, it could do more and more.