of course, is the pioneer of digital currency bitcoin today. bitcoin will persist until some time later. when bitcoin can be replaced by altcoin, then the future of digital currency would end.
Exactly as it is. If bitcoin will become a fail one all of cryptos will suffer too and because that is the main thing no such replacement will happen.
A crash bitcoin means a crash of cryptocurrency and it will never bring back the support it already received by the community.
Yeah if bitcoin dies or disappear in future then many people will loose faith in crypto currencies and will prefer to quit them and there is full possibility of this to happen in future.