USB 3.0 isn't backwards compatible with all devices. The popular MagicJack for instance won't work with USB 3.0. Also several high end USB to digital audio transports don't work with it. So unless the makers of these devices all develop new drivers (firmware?) people won't be happy with their new USB 3.0 only computers. I wonder if an old PCI USB 2.0 addin card would take care of this issue as I am sure many of the small high end audio makers won't be updating firmware or even drivers as it is expensive for small companies.