It will never happen to bitcoin. Like Napster is unknown now. Something new will come into.
You may be right, but from the past experience, we have seen how difficult it is to predict future bitcoin price, as shown in
https://bitcointalk.org/index.php?topic=136780.0.
Traders tend to fall into the 80/20 Pareto distribution -- 80% lose and 20% win. Further, 80% of your profits will come from 20% of trades. It is clear that it is possible to predict bitcoin price -- within the realm of probability, of course -- but only a minority will be successful at it.