The future is never set! But one article regarding ATI after the AMD buy out points at the possible and even eventual use of external boxes to handle graphics for the home pc. The brief article and some replies can be seen at
http://www.wincustomize.com/Articles.aspx?AID=140721
Since PCI-E cards initially saw 75w drawn from the power source and increased with many of the newer models since. The concept of external rather then internal cards offers a way to see a means of providing more power for video while lightening the load on the internal supply inside a system. The external type would have it's own power source.