Comment by oneplane

Xen (and XenServer and XCP and the Citrix banded stuff) have been able to live migrate VMs for a really long time. Definitely not something special to VMWare.

Realistically, all the legacy workloads (those that are singletons and can't be load-balanced, need an active GUI session etc) are going to to be problems forever, even if you keep VMWare around.