I guess it's going to a thin client approach. iMac workstations with thunderbolt expansion and processing farms for rendering or what have you. I bet someone would make a killing with the pro market if they sold an easy to integrate and expandable render farm, or something that uses amazon services.
Except that you would have to pipe giga/terabytes of data to/from the cloud - that is why lots of in house rendering and catalogue systems use Fibre Channel and similar technologies - one of the bottlenecks is I/O from the workstation
