There are a couple things to take note of.
Silver is historically about 1/16th of the value of gold, so it it extremely undervalued using that metric. To balance gold would have to drop in half, or silver would need to double. Google "buy silver crash jp morgan" and if that is true, it could explain why silver is undervalued right now.
As oldsmoboat mentioned, inflation could make silver much more valuable. QE2 is about to run out and inflation could take off. It seems like the Fed is actually pushing inflation so that home values level off to 3 times the median household income again without dropping in price. Seems stupid, but what do I know? If you think inflation, moderate to excessive, will set in, then wait to sell.
The end of QE2 wouldn't be an inflationary event, it would be deflationary. All other things being isolated, it would mean Treasury demand goes up from increased rates, this would suck liquidity from other areas, namely stocks and bonds, which would go into treasuries. This would depress stock prices and raise bond rates which would be passed to consumers in the form of higher interest rates. This would decrease the amount of free cash, leading to a deflationary situation.
Another scenario is that other buyers go into USTs after the end of QE2 resulting in no change to UST rates. The only scenario that would result in inflation is if unemployment dropped dramatically, increasing the velocity of money, resulting in economic expansion and wage increases.
The most likely scenario is that the end of QE2 will drain liquidity from commodity futures and drop the price of all commodities as current flow investments go into a more stable asset class.
The 1:16 ratio has already been debunked.
A parabolic bubble is a parabolic bubble. Silver is going to go down eventually, who knows when, but it will settle far lower than $50.
The whole "crash JPM" is a silly analysis created by tin foil hat guys. There is no solid evidence JPM has a huge net short position in, not to mention you can't even see if they have a long position offsetting the shorts they apparently have (creating a net neutral portfolio, or even net long).
But then again, everything you read on the internet is true.