But the difference between that system I referenced and a common PC these days is hardly as stark as a comparison between an HDV camcorder and a RED One. Also, those who are interested in editing HDV (or other forms of HD) are going to buy the system that they need. So, like I said, I'm not sure what you're getting at. People who are content buying a $600 PC for general computing tasks are not out there buying HDV camcorders... No, they're the ones buying the $229 Sanyo DV camcorder with the 4X optical zoom and the 20X digital zoom.
I can run over to Sam's Club and buy a $800 HP complete with LCD monitor that will handle HDV editing far better than that old system. Without altering any hardware, just wiping the hardware and putting on a clean install of WinXP without all the bloated shovel-ware the system comes from the factory with. Tweak a few BIOS settings and off I go. I've also got both a Macbook Pro and a PC notebook. The PC cost me less than $1K and both can handle dual streams of HDV or DVCPROHD and I would consider them both pretty mainstream, consumer products. Oh, a Macbook can do it too no need for the "pro".