A striped RAID can easily keep up with the stream. Problem is storage capacity of uncompressed HDTV. But again many PC based broadcast devices can store a few hours uncompressed. All the AVID platforms are PCs or MACs. And Avid is only one of many vendors offering systems these days.
A couple of 500GB SATA drives in a RAID 5 configuration would provide ample speed and storage for uncompressed HD storage. As far as PCs not having the bandwidth for uncompressed HD, that's horse poo. Star Wars Episode III, recorded in true 1920x1080 4:4:4 RGB, was rendered and edited entirely on AMD Athlon 64 CPUs, common in new household PCs today.
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