btc has many things going for it

• It is established, trusted and accepted on the internet
  It is the easiest way to access black market activity anonymously, such as weapons, drugs, Botnets, adult content
  IT makes it legal to gamble online in the us (and probly others) This is a big plus
  It is deflationary, meant that it is designed to keep rising,
  just as the USD once was backed by gold, btc is backed by electricity costs

One thing holding it back, is the fact that you cant use credit card or paypal to buy it