It's still early if to say bitcoin scarce at this time, there still 4 million that hasn't been in the mining. If already in the 21 million bitcoin mining it can be said with scarce, if there are still many people who still don't have bitcoin and they want to buy bitcoin. Let say, if you have not invested in bitcoin, now is the right time to start. Hold for a long term, and I believe you will become a rich men.