Its possible that we wake up one day and the BitCoin price will drop while all the money will move to the altcoins.
The question is which currency will be more useful, and which will be able to be acknowledged by the regulators.
Yes we can not trust any digital currency for a long time. Today Bitcoin is ruling digital currency world and day by day the popularity of bitcoin is increasing all over the globe. And many new alts are entering this digital world. And some more already become popular in the market. So anything can happen in future any alt can replace bitcoin.