Reddit reviews Stack Silver Get Gold - How to Buy Gold and Silver Bullion without Getting Ripped Off!

Should I buy silver based on the following statements?

I read Stack Silver Get Gold and in chapter 14 the author gives a number of reasons why the price of silver should go up in the future. These, which I've summarized, include the following:

• The world will soon run out of minable silver, and lots of silver is needed for the production of a number of goods.
  
• The price of silver is depressed by governments selling their stockpiles.
  
• The price of silver is being kept artificially low by big traders of silver futures and that can't keep going on forever.
  
• Silver is historically cheap compared to gold, in terms of the gold/silver ratio, and it's reasonable to expect that ratio to bounce back.
  
  After doing a little research, I found that most silver is produced as a byproduct of zinc and lead refining, and the USGS predicts demand for silver to decrease. So I don't think the first statement is really true, silver production will continue for a long time because those other metals will continue to be mined. What about the other statements? How true are they?