Maybe everyone in this forum, has more than 1 or 2 BTC, it can even be more than I said, because I know that all of you have a pretty good income on this forum...
Do not live in the delusion, although there are signatures and bounty campaigns, and some other ways to earn BTC such as various services and buying/selling digital products, you should know that a good part of the forum users converts their BTC to fiat for daily living needs. Of course, there are those who are real holders, and I think a lot of them have at least 1 BTC.
However, the number of addresses containing more than 1 BTC cannot be a valid reason to claim that the number of individual owners is increasing. One person who has 1000 BTC can have 1000 addresses and on every 1 BTC. However, anyone living in a somewhat more developed country in the world could make a plan and buy BTC in smaller amounts during a relatively low price period ($3000 - 2018), and with $250 per month, he would become the owner of 1 BTC.
Might be that one people could own 1 or more bitcoin address but the fact that he has 1 bitcoin or more is already the thing that affects the bitcoin.
I think this is already a great thing for bitcoin as it increases its investors that could potentially increase the market price of bitcoin in the future, for sure it might be alarming if the numbers are decreasing meaning bitcoin is actually decreasing its market, and potentially the market is going down if continue.