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I think Bitcoin will stay even if there is better technology. Maybe they will use new tech to enhance bitcoin. It has taken so long for bitcoin to hit the crowd and day to day stores that I do not see a new currency taking over. Bitcoin will be king.

Here is a Technical Analysis that portends something better might come along. The Head & Shoulders pattern is very bearish. The fact that the /BCT charts dipslay this for ETH/BTC, DASH/BTC, etc portends a superior reference coin is approaching.