Interesting read, though I would say that the scaling examples look more dramatic in effect than what happens on an actual screen.
And the two writers are assuming that bandwidth will be sufficient to provide full bitstream 1080p transmissions - that's not likely to happen. What we will get is bit-starved 1080p, and then we might just as well have full stream 720p. For playback from HD hard media that's not a problem, of course.
Here's the BBC White Paper that was the foundation for their decision on transmission format:
http://www.bbc.co.uk/rd/pubs/whp/whp-pdf-files/WHP092.pdf
From 2004.
And here's what the EBU thinks about how fast HD should be rolled out:
http://www.ebu.ch/CMSimages/en/tec_doc_t3298_tcm6-17109.pdf