1BTC for each person? I think that's impossible since total human is more than total bitcoin. But if we want to think with graph, i think we're between "Innovators" and "Early Adopters".
Now in August 2017 only 16.5 million people could own one bitcoin each if possession would be evenly distributed. There are many that have more than one BTC and millions who have only fractions of it. So if you can afford to buy one now and hold on to it for 10 years, then you are one of the very lucky choosen ones. So folks don't wait buing your coin.
Fortunately most people cannot hodl for psycological reasons and they will always trade for a profit, be that 50% or 5000% profit. And it is good this way because otherwise, it would not be traded and therefore no value. For markets to function we need greedy people, enthisiastic people, panic sellers, doomsday priests, profit takers, day traders, etc. me for my part I am a hodler for many more years to come.
But there is also a time in the future when I will start to sell, probably once I retired to fulfil some of my dreams and get a more luxurious life after work if it still exists by then. Remember that you cannot eat BTC and you can also not take it with you. So with my last breath, I want to have spent or donated my last BTC.