Innovation without risking the system itself (Make a test bed of sorts with other coins)
http://www.cryptocoinsnews.com/news/adam-back-sidechains-can-replace-altcoins-bitcoin-2-0-platforms/2014/04/10
Thanks, that article helps to explain it better, but gosh the whole idea of sidechains really adds a lot of confusion to the bitcoin game. And personally, I don't think this sidechain idea (even if it were to be implemented in full) would have much impact on all of the altcoins. All of the coins (bitcoin included) is a game of speculation/popularity. Buy the coins now that you think will become popular one day. Same with the stock market.