i don't like to read too much into these metrics---same with total number of addresses or total number of blockchain.info wallets. these stats can be easily gamed. we can't actually tell how many "people" control those addresses. if one bitcoin whale were so inclined, he could make himself look like many thousands of "bitcoinaires". just sayin!
True but still if those numbers continue to grow, who might know that one ore more addresses are still owned by a single person, it is not just always the case, the bitcoin community is expanding. if we will see in the future maybe that there are 10 million wallets with at least a single bitcoin on it the it could be alarming too, liquidize and the owner are somewhat holding to a single bitcoin for them to sell at their own likes. If that is the case then truly bitcoin will be scarce and pricey.