Bitcoin distribution
A lot of people who accumulated thousands of coins in the early days spent them on silly things or cashed out during the 2012 bubble.  Lazlo for example, spent 10,000 bitcoins on two pizzas. Nobody knew that bitcoin would rise to the prices we briefly saw in 2013 or that we have today. The same thing will happen again, people have a price and will very likely sell on the way up thereby distributing their 'cheap' early coins to others; it should all balance out in a decade or two.