How does the New York subpoena of important people in Bitcoin affect the currency?
It certainly doesn't mean the end of Bitcoin it just means the the authorities are taking it seriously and making an attempt to understand how the currency works.

It might mean the end of money laundering and evasive techniques to disguise where your money is coming from as the feds will be pushing to regulate it

I dont think it's a bad thing and I also dont think it should be a surprise to anyone, if you millions of dollars of unregulated currency floating about, of cause it's going to be regulated at some point