basically, we no one can predict how long the bitcoin life. even we are also difficult to predict the price of bitcoin.
but as long as the user continues to grow, and the development of bitcoin is getting better, I'm sure it could last longer
Well I agree with you. If many continues to use it for 100's of years, maybe bitcoin will be alive 100 years from now.
Bitcoin will alive, whenever people like it and use it in different ways, and bitcoin will remain whenever he give us profit. So in this way, we will see bitcoin will never die, because no chance, but the main reason is that for bitcoins, if mostly countries who are not accepted now, if they accept it in government lever, than it has no problem to finish it.
You are right, if bitcoin is accept in all over the world than it will live long life.