I have checked the richlist recently, some of them are from exchanges. More than 50% of BTC are holding by the top 50 people or so. Can't remember the amount though. 61% BTC is held by 16237 addresses.
I have two question-
1. Exchanges are being the giant although BTC holding by them are from customers. Still it's possible that they are trying to be a controller of the crypto community which is very bad I guess.
2. If top 50 people hold 50% of BTC and BTC becomes the global currency, we may face once again the previous era. Being slaver to certain people.
Think at from the point of macro economy. In my opinion, it's something we need to talk.
I doubt Bitcoin becomes the worlds global currency, it's slow and expensive in more ways than one. Transaction costs are especially high, even on exchanges, and Bitcoin is a major power consumer for miners. I do believe the only reason Bitcoin is still here as number 1 is because it hasn't meet a true successor yet. Some people say that Ethereum has answered that call and is the true successor of Bitcoin. It's a nice addition of course with the introduction of smart contracts but not a successor when it depends on Bitcoins success to thrive. When Bitcoin prices fall in the market, Ethereum follows right behind with it, as do all altcoins except for stable coins.