I don't think this means more people is holding 1 bitcoin... The same guy can hold different bitcoin addys with more than 1 btc, and that's a good security practice. Maybe there is more people holding 1 btc, but not as many as the graph shows.
Does not matter who is holding how much or in many addresses by single or multiple people. As long as people are holding bitcoins and not selling them, the price of bitcoin will become higher and higher. However, the bitcoin gone to 9200$ and started to dump again. I think that holders are not so confident that bitcoin can break out resistances.
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, without you being in a large market even though it's already get enough profit ..
Well a whale could have several full btcs with different addresses for each one of them. You're right, it's likely that most of these holders are investors who knows all to well to spread their assets in case something goes awry. It's not easy for regular people like us to commit 8k usd and covert it to bitcoins. And in this forum, it'll take a long time to earn even half a btc.