As Auspm correctly observed above, never before have we had such a shortage of silver on the planet. Compared with silver, gold is in abundance! The silver stockpile shrinks each week, as both investment and industrial demand grows - thus the "natural abundance" GSR of 15:1 is less relevant today. We can expect the GSR to continue to plummet in 2011 - with an increasing velocity over time. Silver however, is unlikely to ever reach full parity with gold because the primary driver of today's growth is the (relatively) 'elastic' investment demand, not the (relatively) 'inelastic' industrial demand.
As the silver price approaches the gold price, new silver buyers (who know silver's volatile character!) will gradually taper off, thereby weakening the price and allowing the fundamentals of supply and demand to reassert themselves. Gold will always be the king, but BOTH (in fact ALL) monetary metals will skyrocket when the various western fiat currency collapses are initiated. For silver however, the moonshot caused by the currency collapses will be a much bigger price driver than the GSR correction that we are witnessing today.
(Of course, with today's western fiat currencies we must be 'careful' when we discuss price expectations, such as "$200 per ounce". Under the hyperinflation that will arise as part of the fiat dollar collapse, all prices will tend to go 'up' numerically - and gold at $50,000 per ounce would not even be blinked at - but such prices would not necessarily mean what we might naturally think they means today. See "When Money Dies" by Adam Fergusson to better understand this.)