It's really possible. BTC was the first one... but not always your first GF becomes your wife )
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.
i like the comparison with the girlfriend/wife.
the thing with technology is that the first one to the table is usually a big one for the early time being, but after some years often with bad decisions, where a different product/company is better this changes. yes, if there is a better coin than there might be no bitcoin in the future, but surly not for the next few years.