The article is interesting, but I think its maths is a bit off.
I would be surprised if the Beeb put everything up on the archive in DVD format (which is used to calculate the storage required etc). Since the license is for non commercial use, I would imaging that the format would be similar to their Broadband service, where you can watch selected Been programs (Eastenders, TOTP2 and the like) over a fast connection. The Beeb uses Real media streaming a lot, and I would think they would continue down this road. Remember, it's for watching at home on a computer, not burning to a DVD...
Having said that, I remember a quote from Paul Daniels a few months ago (possibly here?) where he said most of the tapes of the Daniels show were damaged, and thus lost forever :( Pete Biro is in contact with PD, perrhaps he could confirm?
That would leave the Nixon shows, and the John Fisher stuff (best of magic) but since Fisher did not give permission to put his stuff in the recent 'worlds best magic' shows, would he let them go on the archive?
Still, I think it's a fabby idea, and hope it comes off (I would recommend watching the 70s show 'Wings' if it gets uploaded. The reason I became a pilot...)
Take care, Ian
Edited for improper apostrophe use ;)