I doubt it will die out per se, but secularisation will become predominant. We are the most cynical generation ever - it makes it hard to believe in religion and the paradigm of God - where is the proof? People just have better things to do on a Sunday. Look at some of the random deaths of last week - they cannot all have incurred God's wrath, can they? They didn't pray hard enough? They skipped church one Sunday to do something interesting? They weren't Christian?
Christianity has only survived this long because of fear of moral turpitude. Let's face it, Christians don't want do be Christian. You don't get a choice. You cannot wait until you are old enough to make that decision and say no. You get Christened. You attend church every Sunday. You attend a Christian school. You were brought up well, you propose, so Christianity cannot be a bad thing, right? Well, I will do the exact same thing to my children. And so the circle of life continues.
Put simply, why put your faith and devotion into Christianity when the returns are morally and socially dubious at best? You might live longer. You might miss being killed by a plane accident. Or you might realise that these are events of a much higher being than God - fate - that nobody - nobody - has any control over. Christians need to really do some due diligence.