I think people will stop pirating games when games installed files are going to be like 20 GB.
Heh, games are getting there!
WoW is ~14 GB, and GRID comes to about 10 GB installed. With realism and huge worlds being demanded more for games, I imagine it'll happen soon.
Interestingly enough WoW uses bittorrent to download updates.
I've been pretty skeptical of the technology of bittorrent, though. It hates firewalls, and finding good peers is problematic. The protocol is also inherently biased against asymmetric connections. In any case, it seems that I rarely get my entire bandwidth from a bittorrent connection. In the time it takes to find a few good peers with bittorrent, I can have a pretty good size portion of a direct download already downloaded.
Frankly, 10 Mb/s is 10 Mb/s whether it's from 20 sources or 1 source. And in all honesty, 20 sources is actually less efficient because of overhead.