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.