Responding to the apples and oranges of Amiga comparisons to PCs. Some people are just religious. I bought my Amiga long ago in 1985, after I saw it's multi-tasking, it's amazing graphics design software, and after seeing it genlock and realizing that I could use this as a great video editing and production platform.
We were told this is what the Amiga was all about. What passes for Amiga today is just an OS and those amazing capabilities have been dwarfed by others. There is no Amiga equivalent to Media Center or Apple's Front Row on the platform. The Amiga doesn't know what 1080i or 1080p is in hardware support these days.
AMD and ATI and NVidia are already doing what mr. R suggests, in that they have a 64 bit cpu in it's own native mode that does all of this stuff already. To say that it's not happening is just not really the case.
As far as TV stations using Amigas etc. They aren't using PowerPC based ones they used the other ones, I worked for several of them. But this isn't really happening anymore because they can't get replacement parts and they are all becoming antiquities thanks to companies like NewTek Scala, who did this stuff on the Amiga and now do it on modern PC hardware.
If the Amiga is to regain it's nitch in these areas, a lot of hardware and software inventiveness would have to happen. The old companies surely ain't coming back for something they have done elsewhere including ancient powerpc macs..
Aros is a great OS people need to write programs for it and innovate with it, if the spirit of the machine is to survive. Apple's new Intel machines are 4x-5x faster than the powerpc versions because the development is just that far ahead. The platform needs cheap cool new cutting edge hardware and a new direction, if this is to come back.