Currency failure generally occurs due to the type of hyperinflation, and there is always the potential for technical failure, currency competition, political issues and so on. As the main basic rule, there is no currency that can be considered very safe from failure and difficult times. so is it possible that bitcoin can become worthless?
I don't think so that BTC will be worthless ever. BTC is not like flat currency like others and as it using latest technology which is more secure and i think BTC will go in strong position day by day. We can see its promotion when many county now thinking about this currency for their economy. So be connected with BTC.