Your last point, you are outlining an inflationary scanario so yeah silver will go up at a higher rate then gold, but the view of the original writer was of a severe deflation, in which case I don't think silver will do well in relation to gold

You can say silver is corellated to gold, and it is, but silver can also be viewed as a credit spread and the last few months have shown that when credit spreads rise so does the gold silver ratio.

as for demand/supply fundamentals, I dont think that would matter much in a deflation, silver would get hammered, and by the time gold is at $3000 the greater part of the deflation will have passed and we would probably be on a new inflationary cycle.

Go to stock charts and a weekly or monthly view of Gold/Silver and gold/commodities , Gold is winning hands down , which is great long term news for gold miners.