I agree, the best way to accomplish this is to disable HA/DRS, then disconnect/remove host and add host into the new DC. Once that has been done, you can destroy DCA. Also, make sure if you have a folder structure in your Virtual Machines and templates view that the VM's get added back into their folders. As soon as you remove the host with it's VM's running, and add host back in, the folder structure for your VM's will be no more.