Why?

Circle looks interesting so far. Take a look at this intro video:
https://dotsub.com/view/472e43ab-0c1c-48a4-8f38-3780e18fcff5

Things like Circle can only make Bitcoin more popular and take it mainstream. But even when Bitcoin is mainstream, there will always be ways for hackers and crypto-anarchists to use Bitcoin anonymously and untraceably.

So everyone wins.