The position of Bitcoin is undoubted,however, other digital currency also own potential to be the best one. There is no sign that the best one is not best ones.
The anonymous transactions feature is currently the next best thing and there's no technology that can provide it better than CryptoNote. I think CN based coins are potential winners in the long run.
While a minority of users probably need anonymity, the majority are probably not interested in anonymity services.