Five hundredths of a percent of bitcoin investors control over 40% of all bitcoin, and just under half a percent of all bitcoin investors control over 5/6ths, or 83%, of bitcoin.
There are definitely some whales out there, but I don't think Bitcoin ownership is quite as lopsided as those numbers would suggest. First of all, many early participants amassed huge balances and then basically lost their coins. The anonymous inventor himself is thought to own more than a million coins, and his account hasn't been touched in years. Most likely, he's either dead or no longer has access. Those coins are probably impossible to recover.
Secondly, exchanges and financial institutions will show up on the blockchain as the "owners" of their customers' coins. If you have a balance of 10 BTC at Coinbase, for example, they'll appear to belong to Coinbase on the public ledger. You have to withdraw them to a private wallet before they're technically yours.
Thirdly, with the way some wallet software works, you can end up with many different addresses containing small amounts of coins. They're all technically yours but they look like separate accounts on the public ledger.
The bigger issue with Bitcoin to me is that I just don't see any benefit to the general public. The dream of "being your own bank" doesn't work because of transaction costs (currently $20 per transaction). There are ideas to reduce costs, but those ideas effectively boil down to using a network of middlemen (i.e. banks) to aggregate transactions - but now you're back where you started before Bitcoin was a thing.
EDIT: In the interest of full disclosure, I also thought Minecraft was a stupid game that would never take off. Maybe don't listen to me.