These stats are not really saying much I'm afraid. Some of the bigger wallets are from exchanges that represent thousands (millions?) of investors.
On the other hand, a lot of actual blockchain users have multiple wallets and many of the wallets with value greater then USD 1000 are lost or remain untouched.
Still its interesting to think about these numbers. Less then 2 million people actually use the chain let alone have direct control over their bitcoins.