While the Amiga was impressive in the 80's, they failed to continue on that path of technical innovation. The technical lead they provided simply vanished by having everyone else move forwards just a little bit faster than they were. Thus the inevitable erosion of their space. By the mid 90's there was little compelling that gave the Amiga an advantage and thus they had their lunch eaten. I suspect if we were to project the Amiga forward to today it would have actually meant us being in a worse place than we are today.
In the same way if we had of waited for Silicon Graphics to provide desktop 3D graphics, we would have been waiting for a LONG time and at a high price.