No one knows and no one can predits on how long bitcoin will be alive and kicking in the market,though bitcoins dominates todays market this will not last foreverfor sure and new currency will defeat bitcoin
We accept the reality that everything must change, the only thing is that we don't know when it comes. And it is possible to happen to bitcoin, maybe you could say it won't last forever but still we enjoy the moment that bitcoin is still alive. And while it is still in the market, we must have to take this opportunity and be a part of this great technology.