Why would bitcoins be dead if you say that the price needs 4 years to stabilise? That doesn't make sense at all. If bitcoins were dead than the price would be 0, or at least very close to 0 and not at 18.700 USD as it is right now. Bitcoins and other crypto currencies tend to move in cycles. There are always bull and bear markets, we shouldn't worry too much about it. Also if you are true that in 4 years we are back at the old ATH then it still a pretty good return. From current levels it would mean a rise of more than 250%, which is a pretty good return if you ask me in 4 years. Much more than you would make with stocks, bonds or your savings account.