If Commodere would still be alive that would mean that the PC market wouldn't be as big as it is today. ( hey, someone has to be the biggest, right? :-) )
Much of the performance race that we have seen in the PC market would never have happened.
The hardware platform would probably have been closed, so third party hard ware would be rare.
Commodore would most likely have developed some kind of new chipsets for sound and video. The sound would have been controlled by a DSP ( didn't they do that in some models of the A3000? ) and the video chipsets would have been 3D capable and controlled by something like D3D.
