For certain values of support.
The key for customers in the long run is a combination of what "support" actually means when the rubber hits the road and who is most likely to try and fleece them eventually.
Can Canonical and Oracle actually provide effective support for the hypervisor - or any other level of the stack - when something goes wrong given their limited to non-existent engineering investment in the relevant upstream projects?
Will Oracle expand this newly discovered sense of "openness" to their database cash cow where for many years the only formally supported Linux-based virtualization solutions have been Oracle's?