earl who replied to you seems to have been hell-banned. So I am copying his comment because I think it adds valuable data points.

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   Amazon is experiencing tons of growth right now, the last thing they want to 
   do is keep having to rehire associate workers. If you are good, there is no 
   reason why they should fire you.

Kindly educate yourself before writing [1]. Because despite your hypotheticals, it's well documented that amazon is doing precisely that: hiring tons of workers, firing them very quickly, and intimidating injured ones into signing papers saying it wasn't from the job. Amazon even stage ambulances outside their unconditioned warehouses in order to be prepared when employees get sick and have to be taken to hospital because of heat.

From the article:

   Temporary employees interviewed said few people in their working groups 
   actually made it to a permanent Amazon position. Instead, they said they 
   were pushed harder and harder to work faster and faster until they were 
   terminated, they quit or they got injured. Those interviewed say turnover at 
   the warehouse is high and many hires don't last more than a few months.

This whole program is a bullshit ruse to deflect criticism. Because guess what: the first thing a student needs is a reliable schedule. Mandatory overtime kills taking classes, because your butt often needs to be in the seat at a fixed time, particularly for tests.

[1] http://www.mcall.com/news/local/mc-allentown-amazon-complain....

[2] http://www.motherjones.com/politics/2012/02/mac-mcclelland-f....