Software Piracy tends to push hardware sales, so I don't think it killed the Amiga... probably actually kept it going for longer than it would have if there was no piracy.
To paraphrase the people at EPIC (Gears of War Creators) - "the people who know how and install top end graphics accelerators on their PCs are the same ones who know how to use newsgroups and torrent tools."
Off but on the subject too - PC Gaming is dieing due to piracy - but only cause consoles can take over. You can't compare the experience/quality of a 52" HDTV + Xbox360(or PS3) with a PC Gaming not matter the video card!
In the heyday of the Amiga, there where no consoles that could perform at the quality/level of Amigas (80's). It wasn't until the SEGA Genensis/SNES that some games even came close... but nothing as good as Wings or Awesome on those consoles! So getting games easy was probably something that kept the Amiga alive....
I also remember getting Amiga software was so hard unless you mailed ordered. EggHead software near me quit carrying Amiga software in 91 and EB quite in 92.
Part of the reason I went to a PC in 94 -couldn't find software new or used!
My 2 cents worth....
